Adding boilerplate files

Signed-off-by: Per Ploug <per.ploug@zalando.de>
2024-12-22 02:56:03 +00:00 · 2018-10-08 13:17:05 +02:00 · 2018-10-08 13:17:05 +02:00 · 3db0cc3135
commit 3db0cc3135
parent e9b677605a
40 changed files with 3247 additions and 2 deletions
--- a/.github/CODEOWNERS
+++ b/.github/CODEOWNERS
@ -0,0 +1,35 @@
+# These owners will be the default owners for everything in
+# the repo. 
+*       @arjunrn
+
+
+
+# Samples for assigning codeowners below:
+# Order is important; the last matching pattern takes the most
+# precedence. When someone opens a pull request that only
+# modifies JS files, only @js-owner and not the global
+# owner(s) will be requested for a review.
+# *.js    @js-owner
+
+# You can also use email addresses if you prefer. They'll be
+# used to look up users just like we do for commit author
+# emails.
+# *.go docs@example.com
+
+# In this example, @doctocat owns any files in the build/logs
+# directory at the root of the repository and any of its
+# subdirectories.
+# /build/logs/ @doctocat
+
+# The `docs/*` pattern will match files like
+# `docs/getting-started.md` but not further nested files like
+# `docs/build-app/troubleshooting.md`.
+# docs/*  docs@example.com
+
+# In this example, @octocat owns any file in an apps directory
+# anywhere in your repository.
+# apps/ @octocat
+
+# In this example, @doctocat owns any file in the `/docs`
+# directory in the root of your repository.
+# /docs/ @doctocat
--- a/.github/ISSUE_TEMPLATE.md
+++ b/.github/ISSUE_TEMPLATE.md
@ -0,0 +1,17 @@
+## Expected Behavior
+
+
+## Actual Behavior
+
+
+## Steps to Reproduce the Problem
+
+  1.
+  1.
+  1.
+
+## Specifications
+
+  - Version:
+  - Platform:
+  - Subsystem:
--- a/.github/PULL_REQUEST_TEMPLATE.md
+++ b/.github/PULL_REQUEST_TEMPLATE.md
@ -0,0 +1,31 @@
+# One-line summary
+
+> Issue : #1234 (only if appropriate)
+
+## Description
+A few sentences describing the overall goals of the pull request's
+commits.
+
+## Types of Changes
+_What types of changes does your code introduce? Keep the ones that apply:_
+
+- New feature (non-breaking change which adds functionality)
+- Bug fix (non-breaking change which fixes an issue)
+- Configuration change
+- Refactor/improvements
+- Documentation / non-code
+
+## Tasks
+_List of tasks you will do to complete the PR_
+  - [ ] Created Task 1
+  - [ ] Created Task 2
+  - [ ] To-do Task 3
+
+## Review
+_List of tasks the reviewer must do to review the PR_
+- [ ] Tests
+- [ ] Documentation
+- [ ] CHANGELOG
+
+## Deployment Notes
+These should highlight any db migrations, feature toggles, etc.
--- a/.gitignore
+++ b/.gitignore
@ -0,0 +1,2 @@
+build/
+apiserver.local.config/
--- a/.travis.yml
+++ b/.travis.yml
@ -0,0 +1,11 @@
+language: go
+
+go:
+  - "1.11"
+
+env:
+- GO111MODULE=on
+
+script:
+  - make test
+  - make build.docker
--- a/CODE_OF_CONDUCT.md
+++ b/CODE_OF_CONDUCT.md
@ -0,0 +1,74 @@
+# Contributor Covenant Code of Conduct
+
+## Our Pledge
+
+In the interest of fostering an open and welcoming environment, we as
+contributors and maintainers pledge to making participation in our project and
+our community a harassment-free experience for everyone, regardless of age, body
+size, disability, ethnicity, gender identity and expression, level of experience,
+nationality, personal appearance, race, religion, or sexual identity and
+orientation.
+
+## Our Standards
+
+Examples of behavior that contributes to creating a positive environment
+include:
+
+* Using welcoming and inclusive language
+* Being respectful of differing viewpoints and experiences
+* Gracefully accepting constructive criticism
+* Focusing on what is best for the community
+* Showing empathy towards other community members
+
+Examples of unacceptable behavior by participants include:
+
+* The use of sexualized language or imagery and unwelcome sexual attention or
+advances
+* Trolling, insulting/derogatory comments, and personal or political attacks
+* Public or private harassment
+* Publishing others' private information, such as a physical or electronic
+  address, without explicit permission
+* Other conduct which could reasonably be considered inappropriate in a
+  professional setting
+
+## Our Responsibilities
+
+Project maintainers are responsible for clarifying the standards of acceptable
+behavior and are expected to take appropriate and fair corrective action in
+response to any instances of unacceptable behavior.
+
+Project maintainers have the right and responsibility to remove, edit, or
+reject comments, commits, code, wiki edits, issues, and other contributions
+that are not aligned to this Code of Conduct, or to ban temporarily or
+permanently any contributor for other behaviors that they deem inappropriate,
+threatening, offensive, or harmful.
+
+## Scope
+
+This Code of Conduct applies both within project spaces and in public spaces
+when an individual is representing the project or its community. Examples of
+representing a project or community include using an official project e-mail
+address, posting via an official social media account, or acting as an appointed
+representative at an online or offline event. Representation of a project may be
+further defined and clarified by project maintainers.
+
+## Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be
+reported by contacting the project team see [MAINTAINERS.md](MAINTAINERS.md). All
+complaints will be reviewed and investigated and will result in a response that
+is deemed necessary and appropriate to the circumstances. The project team is
+obligated to maintain confidentiality with regard to the reporter of an incident.
+Further details of specific enforcement policies may be posted separately.
+
+Project maintainers who do not follow or enforce the Code of Conduct in good
+faith may face temporary or permanent repercussions as determined by other
+members of the project's leadership.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant][homepage], version 1.4,
+available at [http://contributor-covenant.org/version/1/4][version]
+
+[homepage]: http://contributor-covenant.org
+[version]: http://contributor-covenant.org/version/1/4/
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@ -0,0 +1,86 @@
+# Contributing
+
+**Thank you for your interest in making the project better and more useful.
+Your contributions are highly welcome.**
+
+There are multiple ways of getting involved:
+
+- [Report a bug](#report-a-bug)
+- [Suggest a feature](#suggest-a-feature)
+- [Contribute code](#contribute-code)
+
+Below are a few guidelines we would like you to follow.
+If you need help, please reach out to us by opening an issue.
+
+## Report a bug
+
+Reporting bugs is one of the best ways to contribute. Before creating a bug
+report, please check that an [issue](/issues) reporting the same problem does
+not already exist. If there is such an issue, you may add your information as a
+comment.
+
+To report a new bug you should open an issue that summarizes the bug and set
+the label to "bug".
+
+If you want to provide a fix along with your bug report: That is great! In this
+case please send us a pull request as described in section [Contribute
+Code](#contribute-code).
+
+## Suggest a feature
+
+To request a new feature you should open an [issue](../../issues/new) and
+summarize the desired functionality and its use case. Set the issue label to
+"feature".
+
+## Contribute code
+
+This is an outline of what the workflow for code contributions looks like
+
+- Check the list of open [issues](../../issues). Either assign an existing
+  issue to yourself, or create a new one that you would like work on and
+  discuss your ideas and use cases.
+
+It is always best to discuss your plans beforehand, to ensure that your
+contribution is in line with our goals.
+
+- Fork the repository on GitHub
+- Create a topic branch from where you want to base your work. This is usually master.
+- Open a new pull request, label it `work in progress` and outline what you will be contributing
+- Make commits of logical units.
+- Make sure you sign-off on your commits `git commit -s -m "adding X to change Y"`
+- Write good commit messages (see below).
+- Push your changes to a topic branch in your fork of the repository.
+- As you push your changes, update the pull request with new infomation and tasks as you complete them
+- Project maintainers might comment on your work as you progress
+- When you are done, remove the `work in progess` label and ping the maintainers for a review
+- Your pull request must receive a :thumbsup: from two [maintainers](MAINTAINERS)
+
+Thanks for your contributions!
+
+### Commit messages
+
+Your commit messages ideally can answer two questions: what changed and why.
+The subject line should feature the “what” and the body of the commit should
+describe the “why”.
+
+When creating a pull request, its description should reference the corresponding issue id.
+
+### Sign your work / Developer certificate of origin
+All contributions (including pull requests) must agree to the Developer
+Certificate of Origin (DCO) version 1.1. This is exactly the same one created
+and used by the Linux kernel developers and posted on
+http://developercertificate.org/. This is a developer's certification that he
+or she has the right to submit the patch for inclusion into the project. Simply
+submitting a contribution implies this agreement, however, please include a
+"Signed-off-by" tag in every patch (this tag is a conventional way to confirm
+that you agree to the DCO) - you can automate this with a [Git
+hook](https://stackoverflow.com/questions/15015894/git-add-signed-off-by-line-using-format-signoff-not-working)
+
+```
+git commit -s -m "adding X to change Y"
+```
+
+
+
+
+**Have fun, and happy hacking!**
--- a/CONTRIBUTORS.md
+++ b/CONTRIBUTORS.md
@ -0,0 +1,13 @@
+# Project Contributors
+
+All external contributors to the project, we are grateful for all their help 
+
+## Contributors sorted alphabetically
+
+- **[Name of contributor](https://github.com/user/name)**
+  - Contribution
+  - Contribution
+  
+- **[Name of contributor](https://github.com/user/name)**
+  - Contribution
+  - Contribution
--- a/7
+++ b/7
@ -0,0 +1,7 @@
+FROM registry.opensource.zalan.do/stups/alpine:latest
+MAINTAINER Team Teapot @ Zalando SE <team-teapot@zalando.de>
+
+# add binary
+ADD build/linux/kube-metrics-adapter /
+
+ENTRYPOINT ["/kube-metrics-adapter"]
--- a/2
+++ b/2
@ -1,6 +1,6 @@
 MIT License

-Copyright (c) 2018 The Zalando Incubator
+Copyright (c) 2018 Zalando SE

 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
--- a/3
+++ b/3
@ -0,0 +1,3 @@
+Mikkel Larsen <mikkel.larsen@zalando.de>
+Arjun Naik <arjun.naik@zalando.de>
+Team Teapot <team-teapot@zalando.de>
--- a/42
+++ b/42
@ -0,0 +1,42 @@
+.PHONY: clean test check build.local build.linux build.osx build.docker build.push
+
+BINARY        ?= kube-metrics-adapter
+VERSION       ?= $(shell git describe --tags --always --dirty)
+IMAGE         ?= mikkeloscar/$(BINARY)
+TAG           ?= $(VERSION)
+SOURCES       = $(shell find . -name '*.go')
+DOCKERFILE    ?= Dockerfile
+GOPKGS        = $(shell go list ./...)
+BUILD_FLAGS   ?= -v
+LDFLAGS       ?= -X main.version=$(VERSION) -w -s
+
+default: build.local
+
+clean:
+	rm -rf build
+
+test:
+	go test -v $(GOPKGS)
+
+check:
+	golint $(GOPKGS)
+	go vet -v $(GOPKGS)
+
+build.local: build/$(BINARY)
+build.linux: build/linux/$(BINARY)
+build.osx: build/osx/$(BINARY)
+
+build/$(BINARY): go.mod $(SOURCES)
+	CGO_ENABLED=0 go build -o build/$(BINARY) $(BUILD_FLAGS) -ldflags "$(LDFLAGS)" .
+
+build/linux/$(BINARY): go.mod $(SOURCES)
+	GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build $(BUILD_FLAGS) -o build/linux/$(BINARY) -ldflags "$(LDFLAGS)" .
+
+build/osx/$(BINARY): go.mod $(SOURCES)
+	GOOS=darwin GOARCH=amd64 CGO_ENABLED=0 go build $(BUILD_FLAGS) -o build/osx/$(BINARY) -ldflags "$(LDFLAGS)" .
+
+build.docker: build.linux
+	docker build --rm -t "$(IMAGE):$(TAG)" -f $(DOCKERFILE) .
+
+build.push: build.docker
+	docker push "$(IMAGE):$(TAG)"
--- a/README.md
+++ b/README.md
@ -1,2 +1,296 @@
 # kube-metrics-adapter
-General purpose metrics adapter for Kubernetes HPA metrics
+[![Build Status](https://travis-ci.com/mikkeloscar/kube-metrics-adapter.svg?branch=master)](https://travis-ci.com/mikkeloscar/kube-metrics-adapter)
+
+Kube Metrics Adapter is a general purpose metrics adapter for Kubernetes that
+can collect and serve custom and external metrics for Horizontal Pod
+Autoscaling.
+
+It discovers Horizontal Pod Autoscaling resources and starts to collect the
+requested metrics and stores them in memory. It's implemented using the
+[custom-metrics-apiserver](https://github.com/kubernetes-incubator/custom-metrics-apiserver)
+library.
+
+Here's an example of a `HorizontalPodAutoscaler` resource configured to get
+`requests-per-second` metrics from each pod of the deployment `myapp`.
+
+```yaml
+apiVersion: autoscaling/v2beta1
+kind: HorizontalPodAutoscaler
+metadata:
+  name: myapp-hpa
+  annotations:
+    # metric-config.<metricType>.<metricName>.<collectorName>/<configKey>
+    metric-config.pods.requests-per-second.json-path/json-key: "$.http_server.rps"
+    metric-config.pods.requests-per-second.json-path/path: /metrics
+    metric-config.pods.requests-per-second.json-path/port: "9090"
+spec:
+  scaleTargetRef:
+    apiVersion: apps/v1
+    kind: Deployment
+    name: myapp
+  minReplicas: 1
+  maxReplicas: 10
+  metrics:
+  - type: Pods
+    pods:
+      metricName: requests-per-second
+      targetAverageValue: 1k
+```
+
+The `metric-config.*` annotations are used by the `kube-metrics-adapter` to
+configure a collector for getting the metrics. In the above example it
+configures a *json-path pod collector*.
+
+## Building
+
+This project uses [Go modules](https://github.com/golang/go/wiki/Modules) as
+introduced in Go 1.11 therefore you need Go >=1.11 installed in order to build.
+If using Go 1.11 you also need to [activate Module
+support](https://github.com/golang/go/wiki/Modules#installing-and-activating-module-support).
+
+Assuming Go has been setup with module support it can be built simply by running:
+
+```sh
+export GO111MODULE=on # needed if the project is checked out in your $GOPATH.
+$ make
+```
+
+## Collectors
+
+Collectors are different implementations for getting metrics requested by an
+HPA resource. They are configured based on HPA resources and started on-demand by the
+`kube-metrics-adapter` to only collect the metrics required for scaling the application.
+
+The collectors are configured either simply based on the metrics defined in an
+HPA resource, or via additional annotations on the HPA resource.
+
+## Pod collector
+
+The pod collector allows collecting metrics from each pod matched by the HPA.
+Currently only `json-path` collection is supported.
+
+### Supported metrics
+
+| Metric | Description | Type |
+| ------------ | -------------- | ------- |
+| *custom* | No predefined metrics. Metrics are generated from user defined queries. | Pods |
+
+### Example
+
+This is an example of using the pod collector to collect metrics from a json
+metrics endpoint of each pod matched by the HPA.
+
+```yaml
+apiVersion: autoscaling/v2beta1
+kind: HorizontalPodAutoscaler
+metadata:
+  name: myapp-hpa
+  annotations:
+    # metric-config.<metricType>.<metricName>.<collectorName>/<configKey>
+    metric-config.pods.requests-per-second.json-path/json-key: "$.http_server.rps"
+    metric-config.pods.requests-per-second.json-path/path: /metrics
+    metric-config.pods.requests-per-second.json-path/port: "9090"
+spec:
+  scaleTargetRef:
+    apiVersion: apps/v1
+    kind: Deployment
+    name: myapp
+  minReplicas: 1
+  maxReplicas: 10
+  metrics:
+  - type: Pods
+    pods:
+      metricName: requests-per-second
+      targetAverageValue: 1k
+```
+
+The pod collector is configured through the annotations which specify the
+collector name `json-path` and a set of configuration options for the
+collector. `json-key` defines the json-path query for extracting the right
+metric. This assumes the pod is exposing metrics in JSON format. For the above
+example the following JSON data would be expected:
+
+```json
+{
+  "http_server": {
+    "rps": 0.5
+  }
+}
+```
+
+The json-path query support depends on the
+[github.com/oliveagle/jsonpath](https://github.com/oliveagle/jsonpath) library.
+See the README for possible queries. It's expected that the metric you query
+returns something that can be turned into a `float64`.
+
+The other configuration options `path` and `port` specifies where the metrics
+endpoint is exposed on the pod. There's no default values, so they must be
+defined.
+
+## Prometheus collector
+
+The Prometheus collector is a generic collector which can map Prometheus
+queries to metrics that can be used for scaling. This approach is different
+from how it's done in the
+[k8s-prometheus-adapter](https://github.com/DirectXMan12/k8s-prometheus-adapter)
+where all available Prometheus metrics are collected
+and transformed into metrics which the HPA can scale on, and there is no
+possibility to do custom queries.
+With the approach implemented here, users can define custom queries and only metrics
+returned from those queries will be available, reducing the total number of
+metrics stored.
+
+One downside of this approach is that bad performing queries can slow down/kill
+Prometheus, so it can be dangerous to allow in a multi tenant cluster. It's
+also not possible to restrict the available metrics using something like RBAC
+since any user would be able to create the metrics based on a custom query.
+
+I still believe custom queries are more useful, but it's good to be aware of
+the trade-offs between the two approaches.
+
+### Supported metrics
+
+| Metric | Description | Type | Kind |
+| ------------ | -------------- | ------- | -- |
+| *custom* | No predefined metrics. Metrics are generated from user defined queries. | Object | *any* |
+
+### Example
+
+This is an example of an HPA configured to get metrics based on a Prometheus
+query. The query is defined in the annotation
+`metric-config.object.processed-events-per-second.prometheus/query` where
+`processed-events-per-second` is the metric name which will be associated with
+the result of the query.
+
+It also specifies an annotation
+`metric-config.object.processed-events-per-second.prometheus/per-replica` which
+instructs the collector to treat the results as an average over all pods
+targeted by the HPA. This makes it possible to mimic the behavior of
+`targetAverageValue` which is not implemented for metric type `Object` as of
+Kubernetes v1.10. ([It will most likely come in v1.12](https://github.com/kubernetes/kubernetes/pull/64097#event-1696222479)).
+
+```yaml
+apiVersion: autoscaling/v2beta1
+kind: HorizontalPodAutoscaler
+metadata:
+  name: myapp-hpa
+  annotations:
+    # metric-config.<metricType>.<metricName>.<collectorName>/<configKey>
+    metric-config.object.processed-events-per-second.prometheus/query: |
+      scalar(sum(rate(event-service_events_count{application="event-service",processed="true"}[1m])))
+    metric-config.object.processed-events-per-second.prometheus/per-replica: "true"
+spec:
+  scaleTargetRef:
+    apiVersion: apps/v1
+    kind: Deployment
+    name: custom-metrics-consumer
+  minReplicas: 1
+  maxReplicas: 10
+  metrics:
+  - type: Object
+    object:
+      metricName: processed-events-per-second
+      target:
+        apiVersion: v1
+        kind: Service
+        name: event-service
+      targetValue: 10 # this will be treated as targetAverageValue
+```
+
+## Skipper collector
+
+The skipper collector is a simple wrapper around the Prometheus collector to
+make it easy to define an HPA for scaling based on ingress metrics when
+[skipper](https://github.com/zalando/skipper) is used as the ingress
+implementation in your cluster. It assumes you are collecting Prometheus
+metrics from skipper and it provides the correct Prometheus queries out of the
+box so users don't have to define those manually.
+
+### Supported metrics
+
+| Metric | Description | Type | Kind |
+| ----------- | -------------- | ------ | ---- |
+| `requests-per-second` | Scale based on requests per second for a certain ingress. | Object | `Ingress` |
+
+### Example
+
+This is an example of an HPA that will scale based on `requests-per-second` for
+an ingress called `myapp`.
+
+```yaml
+apiVersion: autoscaling/v2beta1
+kind: HorizontalPodAutoscaler
+metadata:
+  name: myapp-hpa
+spec:
+  scaleTargetRef:
+    apiVersion: apps/v1
+    kind: Deployment
+    name: myapp
+  minReplicas: 1
+  maxReplicas: 10
+  metrics:
+  - type: Object
+    object:
+      metricName: requests-per-second
+      target:
+        apiVersion: extensions/v1beta1
+        kind: Ingress
+        name: myapp
+      targetValue: 10 # this will be treated as targetAverageValue
+```
+
+**Note:** As of Kubernetes v1.10 the HPA does not support `targetAverageValue` for
+metrics of type `Object`. In case of requests per second it does not make sense
+to scale on a summed value because you can not make the total requests per
+second go down by adding more pods. For this reason the skipper collector will
+automatically treat the value you define in `targetValue` as an average per pod
+instead of a total sum.
+
+## AWS collector
+
+The AWS collector allows scaling based on external metrics exposed by AWS
+services e.g. SQS queue lengths.
+
+### Supported metrics
+
+| Metric | Description | Type |
+| ------------ | ------- | -- |
+| `sqs-queue-length` | Scale based on SQS queue length | External |
+
+### Example
+
+This is an example of an HPA that will scale based on the length of an SQS
+queue.
+
+```yaml
+apiVersion: autoscaling/v2beta1
+kind: HorizontalPodAutoscaler
+metadata:
+  name: myapp-hpa
+spec:
+  scaleTargetRef:
+    apiVersion: apps/v1
+    kind: Deployment
+    name: custom-metrics-consumer
+  minReplicas: 1
+  maxReplicas: 10
+  metrics:
+  - type: External
+    external:
+      metricName: sqs-queue-length
+      metricSelector:
+        matchLabels:
+          queue-name: foobar
+          region: eu-central-1
+      targetAverageValue: 30
+```
+
+The `matchLabels` are used by `kube-metrics-adapter` to configure a collector
+that will get the queue length for an SQS queue named `foobar` in region
+`eu-central-1`.
+
+The AWS account of the queue currently depends on how `kube-metrics-adapter` is
+configured to get AWS credentials. The normal assumption is that you run the
+adapter in a cluster running in the AWS account where the queue is defined.
+Please open an issue if you would like support for other use cases.
--- a/SECURITY.md
+++ b/SECURITY.md
@ -0,0 +1,7 @@
+We acknowledge that every line of code that we write may potentially contain security issues.
+
+We are trying to deal with it responsibly and provide patches as quickly as  possible. If you have anything to report to us please use the following channels:
+
+Email: Tech-Security@zalando.de
+OR
+Submit your vulnerability report through our bug bounty program at: https://hackerone.com/zalando
--- a/docs/custom-metrics-apiservice.yaml
+++ b/docs/custom-metrics-apiservice.yaml
@ -0,0 +1,13 @@
+apiVersion: apiregistration.k8s.io/v1beta1
+kind: APIService
+metadata:
+  name: v1beta1.custom.metrics.k8s.io
+spec:
+  service:
+    name: kube-metrics-adapter
+    namespace: kube-system
+  group: custom.metrics.k8s.io
+  version: v1beta1
+  insecureSkipTLSVerify: true
+  groupPriorityMinimum: 100
+  versionPriority: 100
--- a/docs/deployment.yaml
+++ b/docs/deployment.yaml
@ -0,0 +1,40 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: kube-metrics-adapter
+  namespace: kube-system
+  labels:
+    application: kube-metrics-adapter
+    version: latest
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      application: kube-metrics-adapter
+  template:
+    metadata:
+      labels:
+        application: kube-metrics-adapter
+        version: latest
+      annotations:
+        iam.amazonaws.com/role: "kube-aws-test-1-app-zmon"
+    spec:
+      serviceAccountName: custom-metrics-apiserver
+      containers:
+      - name: kube-metrics-adapter
+        image: mikkeloscar/kube-metrics-adapter:latest
+        args:
+        # - --v=9
+        - --prometheus-server=http://prometheus.kube-system.svc.cluster.local
+        - --skipper-ingress-metrics
+        - --aws-external-metrics
+        env:
+        - name: AWS_REGION
+          value: eu-central-1
+        resources:
+          limits:
+            cpu: 100m
+            memory: 100Mi
+          requests:
+            cpu: 100m
+            memory: 100Mi
--- a/docs/external-metrics-apiservice.yaml
+++ b/docs/external-metrics-apiservice.yaml
@ -0,0 +1,13 @@
+apiVersion: apiregistration.k8s.io/v1beta1
+kind: APIService
+metadata:
+  name: v1beta1.external.metrics.k8s.io
+spec:
+  service:
+    name: kube-metrics-adapter
+    namespace: kube-system
+  group: external.metrics.k8s.io
+  version: v1beta1
+  insecureSkipTLSVerify: true
+  groupPriorityMinimum: 100
+  versionPriority: 100
--- a/docs/rbac.yaml
+++ b/docs/rbac.yaml
@ -0,0 +1,122 @@
+kind: ServiceAccount
+apiVersion: v1
+metadata:
+  name: custom-metrics-apiserver
+  namespace: kube-system
+
+---
+
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRole
+metadata:
+  name: custom-metrics-server-resources
+rules:
+- apiGroups:
+  - custom.metrics.k8s.io
+  resources: ["*"]
+  verbs: ["*"]
+
+---
+
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRole
+metadata:
+  name: custom-metrics-resource-reader
+rules:
+- apiGroups:
+  - ""
+  resources:
+  - namespaces
+  - pods
+  - services
+  verbs:
+  - get
+  - list
+
+---
+
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRole
+metadata:
+  name: custom-metrics-resource-collector
+rules:
+- apiGroups:
+  - ""
+  resources:
+  - pods
+  verbs:
+  - list
+- apiGroups:
+  - apps
+  resources:
+  - deployments
+  - statefulsets
+  verbs:
+  - get
+- apiGroups:
+  - extensions
+  resources:
+  - ingresses
+  verbs:
+  - get
+
+---
+
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRoleBinding
+metadata:
+  name: hpa-controller-custom-metrics
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: ClusterRole
+  name: custom-metrics-server-resources
+subjects:
+- kind: ServiceAccount
+  name: horizontal-pod-autoscaler
+  namespace: kube-system
+
+---
+
+apiVersion: rbac.authorization.k8s.io/v1
+kind: RoleBinding
+metadata:
+  name: custom-metrics-auth-reader
+  namespace: kube-system
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: Role
+  name: extension-apiserver-authentication-reader
+subjects:
+- kind: ServiceAccount
+  name: custom-metrics-apiserver
+  namespace: kube-system
+
+---
+
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRoleBinding
+metadata:
+  name: custom-metrics:system:auth-delegator
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: ClusterRole
+  name: system:auth-delegator
+subjects:
+- kind: ServiceAccount
+  name: custom-metrics-apiserver
+  namespace: kube-system
+
+---
+
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRoleBinding
+metadata:
+  name: custom-metrics-resource-collector
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: ClusterRole
+  name: custom-metrics-resource-collector
+subjects:
+- kind: ServiceAccount
+  name: custom-metrics-apiserver
+  namespace: kube-system
--- a/docs/service.yaml
+++ b/docs/service.yaml
@ -0,0 +1,11 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: kube-metrics-adapter
+  namespace: kube-system
+spec:
+  ports:
+  - port: 443
+    targetPort: 443
+  selector:
+    application: kube-metrics-adapter
--- a/example/Dockerfile
+++ b/example/Dockerfile
@ -0,0 +1,7 @@
+FROM registry.opensource.zalan.do/stups/alpine:latest
+MAINTAINER Team Teapot @ Zalando SE <team-teapot@zalando.de>
+
+# add binary
+ADD build/linux/custom-metrics-consumer /
+
+ENTRYPOINT ["/custom-metrics-consumer"]
--- a/example/Makefile
+++ b/example/Makefile
@ -0,0 +1,42 @@
+.PHONY: clean test check build.local build.linux build.osx build.docker build.push
+
+BINARY        ?= custom-metrics-consumer
+VERSION       ?= $(shell git describe --tags --always --dirty)
+IMAGE         ?= mikkeloscar/$(BINARY)
+TAG           ?= $(VERSION)
+SOURCES       = $(shell find . -name '*.go')
+DOCKERFILE    ?= Dockerfile
+GOPKGS        = $(shell go list ./...)
+BUILD_FLAGS   ?= -v
+LDFLAGS       ?= -X main.version=$(VERSION) -w -s
+
+default: build.local
+
+clean:
+	rm -rf build
+
+test:
+	go test -v $(GOPKGS)
+
+check:
+	golint $(GOPKGS)
+	go vet -v $(GOPKGS)
+
+build.local: build/$(BINARY)
+build.linux: build/linux/$(BINARY)
+build.osx: build/osx/$(BINARY)
+
+build/$(BINARY): $(SOURCES)
+	CGO_ENABLED=0 go build -o build/$(BINARY) $(BUILD_FLAGS) -ldflags "$(LDFLAGS)" .
+
+build/linux/$(BINARY): $(SOURCES)
+	GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build $(BUILD_FLAGS) -o build/linux/$(BINARY) -ldflags "$(LDFLAGS)" .
+
+build/osx/$(BINARY): $(SOURCES)
+	GOOS=darwin GOARCH=amd64 CGO_ENABLED=0 go build $(BUILD_FLAGS) -o build/osx/$(BINARY) -ldflags "$(LDFLAGS)" .
+
+build.docker: build.linux
+	docker build --rm -t "$(IMAGE):$(TAG)" -f $(DOCKERFILE) .
+
+build.push: build.docker
+	docker push "$(IMAGE):$(TAG)"
--- a/example/deploy/deployment.yaml
+++ b/example/deploy/deployment.yaml
@ -0,0 +1,29 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: custom-metrics-consumer
+  labels:
+    application: custom-metrics-consumer
+    version: latest
+spec:
+  selector:
+    matchLabels:
+      application: custom-metrics-consumer
+  template:
+    metadata:
+      labels:
+        application: custom-metrics-consumer
+        version: latest
+    spec:
+      containers:
+      - name: custom-metrics-consumer
+        image: mikkeloscar/custom-metrics-consumer:latest
+        args:
+        - --fake-queue-length=2000
+        resources:
+          limits:
+            cpu: 10m
+            memory: 25Mi
+          requests:
+            cpu: 10m
+            memory: 25Mi
--- a/example/deploy/hpa.yaml
+++ b/example/deploy/hpa.yaml
@ -0,0 +1,48 @@
+apiVersion: autoscaling/v2beta1
+kind: HorizontalPodAutoscaler
+metadata:
+  name: custom-metrics-consumer
+  namespace: default
+  labels:
+    application: custom-metrics-consumer
+  annotations:
+    # metric-config.<metricType>.<metricName>.<collectorName>/<configKey>
+    metric-config.pods.queue-length.json-path/json-key: "$.queue.length"
+    metric-config.pods.queue-length.json-path/path: /metrics
+    metric-config.pods.queue-length.json-path/port: "9090"
+    # metric-config.object.requests-per-second.prometheus/query: |
+    #   scalar(sum(rate(skipper_serve_host_duration_seconds_count{host="custom-metrics_example_org"}[1m])))
+    # metric-config.object.requests-per-second.prometheus/per-replica: "true"
+    # metric-config.object.requests-per-second.skipper/interval: "1s"
+spec:
+  scaleTargetRef:
+    apiVersion: apps/v1
+    kind: Deployment
+    name: custom-metrics-consumer
+  minReplicas: 1
+  maxReplicas: 10
+  metrics:
+  # - type: Resource
+  #   resource:
+  #     name: cpu
+  #     targetAverageUtilization: 50
+  - type: Pods
+    pods:
+      metricName: queue-length
+      targetAverageValue: 1k
+  - type: Object
+    object:
+      metricName: requests-per-second
+      target:
+        apiVersion: extensions/v1beta1
+        kind: Ingress
+        name: custom-metrics-consumer
+      targetValue: 10 # this will be treated as targetAverageValue
+  - type: External
+    external:
+      metricName: sqs-queue-length
+      metricSelector:
+        matchLabels:
+          queue-name: foobar
+          region: eu-central-1
+      targetAverageValue: 30
--- a/example/deploy/ingress.yaml
+++ b/example/deploy/ingress.yaml
@ -0,0 +1,14 @@
+apiVersion: extensions/v1beta1
+kind: Ingress
+metadata:
+  name: custom-metrics-consumer
+  labels:
+    application: custom-metrics-consumer
+spec:
+  rules:
+  - host: custom-metrics.example.org
+    http:
+      paths:
+      - backend:
+          serviceName: custom-metrics-consumer
+          servicePort: 80
--- a/example/deploy/service.yaml
+++ b/example/deploy/service.yaml
@ -0,0 +1,14 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: custom-metrics-consumer
+  labels:
+    application: custom-metrics-consumer
+spec:
+  ports:
+  - port: 80
+    protocol: TCP
+    targetPort: 9090
+  selector:
+    application: custom-metrics-consumer
+  type: ClusterIP
--- a/example/main.go
+++ b/example/main.go
@ -0,0 +1,33 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"net/http"
+	"time"
+)
+
+func metricsHandler(w http.ResponseWriter, r *http.Request) {
+	w.WriteHeader(200)
+	w.Write([]byte(fmt.Sprintf(`{"queue": {"length": %d}}`, size)))
+}
+
+var (
+	size int
+)
+
+func main() {
+	flag.IntVar(&size, "fake-queue-length", 10, "Fake queue length for fake metrics.")
+	flag.Parse()
+
+	mux := http.NewServeMux()
+	mux.HandleFunc("/metrics", metricsHandler)
+
+	server := &http.Server{
+		Addr:        ":9090",
+		Handler:     mux,
+		ReadTimeout: 5 * time.Second,
+	}
+
+	server.ListenAndServe()
+}
--- a/go.mod
+++ b/go.mod
@ -0,0 +1,94 @@
+module github.com/mikkeloscar/kube-metrics-adapter
+
+require (
+	bitbucket.org/ww/goautoneg v0.0.0-20120707110453-75cd24fc2f2c // indirect
+	github.com/BurntSushi/toml v0.3.0 // indirect
+	github.com/NYTimes/gziphandler v1.0.1 // indirect
+	github.com/PuerkitoBio/purell v1.1.0 // indirect
+	github.com/PuerkitoBio/urlesc v0.0.0-20170810143723-de5bf2ad4578 // indirect
+	github.com/aws/aws-sdk-go v1.15.21
+	github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973 // indirect
+	github.com/boltdb/bolt v1.3.1 // indirect
+	github.com/coreos/bbolt v1.3.0 // indirect
+	github.com/coreos/etcd v3.3.9+incompatible // indirect
+	github.com/coreos/go-semver v0.2.0 // indirect
+	github.com/coreos/go-systemd v0.0.0-20180705093442-88bfeed483d3 // indirect
+	github.com/coreos/pkg v0.0.0-20180108230652-97fdf19511ea // indirect
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/dgrijalva/jwt-go v3.2.0+incompatible // indirect
+	github.com/elazarl/go-bindata-assetfs v1.0.0 // indirect
+	github.com/emicklei/go-restful v2.8.0+incompatible // indirect
+	github.com/emicklei/go-restful-swagger12 v0.0.0-20170926063155-7524189396c6 // indirect
+	github.com/evanphx/json-patch v3.0.0+incompatible // indirect
+	github.com/fsnotify/fsnotify v1.4.7 // indirect
+	github.com/ghodss/yaml v1.0.0 // indirect
+	github.com/go-openapi/jsonpointer v0.0.0-20180322222829-3a0015ad55fa // indirect
+	github.com/go-openapi/jsonreference v0.0.0-20180322222742-3fb327e6747d // indirect
+	github.com/go-openapi/spec v0.0.0-20180801175345-384415f06ee2 // indirect
+	github.com/go-openapi/swag v0.0.0-20180715190254-becd2f08beaf // indirect
+	github.com/gogo/protobuf v1.1.1 // indirect
+	github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b
+	github.com/golang/groupcache v0.0.0-20180513044358-24b0969c4cb7 // indirect
+	github.com/golang/protobuf v1.2.0 // indirect
+	github.com/google/btree v0.0.0-20180813153112-4030bb1f1f0c // indirect
+	github.com/google/gofuzz v0.0.0-20170612174753-24818f796faf // indirect
+	github.com/googleapis/gnostic v0.2.0 // indirect
+	github.com/gopherjs/gopherjs v0.0.0-20180820052304-89baedc74dd7 // indirect
+	github.com/gorilla/websocket v1.3.0 // indirect
+	github.com/gregjones/httpcache v0.0.0-20180305231024-9cad4c3443a7 // indirect
+	github.com/grpc-ecosystem/go-grpc-prometheus v1.2.0 // indirect
+	github.com/grpc-ecosystem/grpc-gateway v1.4.1 // indirect
+	github.com/hashicorp/golang-lru v0.0.0-20180201235237-0fb14efe8c47 // indirect
+	github.com/hpcloud/tail v1.0.0 // indirect
+	github.com/imdario/mergo v0.3.6 // indirect
+	github.com/inconshreveable/mousetrap v1.0.0 // indirect
+	github.com/jonboulle/clockwork v0.1.0 // indirect
+	github.com/json-iterator/go v1.1.5 // indirect
+	github.com/jtolds/gls v4.2.1+incompatible // indirect
+	github.com/kubernetes-incubator/custom-metrics-apiserver v0.0.0-20180824182428-26e5299457d3
+	github.com/mailru/easyjson v0.0.0-20180823135443-60711f1a8329 // indirect
+	github.com/matttproud/golang_protobuf_extensions v1.0.1 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.1 // indirect
+	github.com/oliveagle/jsonpath v0.0.0-20180606110733-2e52cf6e6852
+	github.com/onsi/ginkgo v1.6.0 // indirect
+	github.com/onsi/gomega v1.4.1 // indirect
+	github.com/pborman/uuid v0.0.0-20180122190007-c65b2f87fee3 // indirect
+	github.com/peterbourgon/diskv v2.0.1+incompatible // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/prometheus/client_golang v0.9.0-pre1.0.20180824101016-4eb539fa85a2
+	github.com/prometheus/client_model v0.0.0-20180712105110-5c3871d89910 // indirect
+	github.com/prometheus/common v0.0.0-20180801064454-c7de2306084e
+	github.com/prometheus/procfs v0.0.0-20180725123919-05ee40e3a273 // indirect
+	github.com/sirupsen/logrus v1.0.6 // indirect
+	github.com/smartystreets/assertions v0.0.0-20180820201707-7c9eb446e3cf // indirect
+	github.com/smartystreets/goconvey v0.0.0-20180222194500-ef6db91d284a // indirect
+	github.com/soheilhy/cmux v0.1.4 // indirect
+	github.com/spf13/cobra v0.0.3
+	github.com/spf13/pflag v1.0.2 // indirect
+	github.com/stretchr/testify v1.2.2 // indirect
+	github.com/tmc/grpc-websocket-proxy v0.0.0-20171017195756-830351dc03c6 // indirect
+	github.com/ugorji/go v1.1.1 // indirect
+	github.com/xiang90/probing v0.0.0-20160813154853-07dd2e8dfe18 // indirect
+	golang.org/x/crypto v0.0.0-20180820150726-614d502a4dac // indirect
+	golang.org/x/net v0.0.0-20180824152047-4bcd98cce591 // indirect
+	golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f // indirect
+	golang.org/x/sys v0.0.0-20180824143301-4910a1d54f87 // indirect
+	golang.org/x/text v0.3.0 // indirect
+	golang.org/x/time v0.0.0-20180412165947-fbb02b2291d2 // indirect
+	google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8 // indirect
+	google.golang.org/grpc v1.14.0 // indirect
+	gopkg.in/airbrake/gobrake.v2 v2.0.9 // indirect
+	gopkg.in/fsnotify.v1 v1.4.7 // indirect
+	gopkg.in/gemnasium/logrus-airbrake-hook.v2 v2.1.2 // indirect
+	gopkg.in/inf.v0 v0.9.1 // indirect
+	gopkg.in/natefinch/lumberjack.v2 v2.0.0-20170531160350-a96e63847dc3 // indirect
+	gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 // indirect
+	gopkg.in/yaml.v2 v2.2.1 // indirect
+	k8s.io/api v0.0.0-20180628040859-072894a440bd
+	k8s.io/apimachinery v0.0.0-20180621070125-103fd098999d
+	k8s.io/apiserver v0.0.0-20180628044425-01459b68eb5f
+	k8s.io/client-go v8.0.0+incompatible
+	k8s.io/kube-openapi v0.0.0-20180731170545-e3762e86a74c // indirect
+	k8s.io/metrics v0.0.0-20180718014405-6efa0bfaa5c1
+)
--- a/go.sum
+++ b/go.sum
@ -0,0 +1,186 @@
+bitbucket.org/ww/goautoneg v0.0.0-20120707110453-75cd24fc2f2c h1:t+Ra932MCC0eeyD/vigXqMbZTzgZjd4JOfBJWC6VSMI=
+bitbucket.org/ww/goautoneg v0.0.0-20120707110453-75cd24fc2f2c/go.mod h1:1vhO7Mn/FZMgOgDVGLy5X1mE6rq1HbkBdkF/yj8zkcg=
+github.com/BurntSushi/toml v0.3.0 h1:e1/Ivsx3Z0FVTV0NSOv/aVgbUWyQuzj7DDnFblkRvsY=
+github.com/BurntSushi/toml v0.3.0/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/NYTimes/gziphandler v1.0.1 h1:iLrQrdwjDd52kHDA5op2UBJFjmOb9g+7scBan4RN8F0=
+github.com/NYTimes/gziphandler v1.0.1/go.mod h1:3wb06e3pkSAbeQ52E9H9iFoQsEEwGN64994WTCIhntQ=
+github.com/PuerkitoBio/purell v1.1.0 h1:rmGxhojJlM0tuKtfdvliR84CFHljx9ag64t2xmVkjK4=
+github.com/PuerkitoBio/purell v1.1.0/go.mod h1:c11w/QuzBsJSee3cPx9rAFu61PvFxuPbtSwDGJws/X0=
+github.com/PuerkitoBio/urlesc v0.0.0-20170810143723-de5bf2ad4578 h1:d+Bc7a5rLufV/sSk/8dngufqelfh6jnri85riMAaF/M=
+github.com/PuerkitoBio/urlesc v0.0.0-20170810143723-de5bf2ad4578/go.mod h1:uGdkoq3SwY9Y+13GIhn11/XLaGBb4BfwItxLd5jeuXE=
+github.com/aws/aws-sdk-go v1.15.21 h1:STLvc6RrpycslC1NRtTvt/YSgDkIGCTrB9K9vE5R2oQ=
+github.com/aws/aws-sdk-go v1.15.21/go.mod h1:mFuSZ37Z9YOHbQEwBWztmVzqXrEkub65tZoCYDt7FT0=
+github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973 h1:xJ4a3vCFaGF/jqvzLMYoU8P317H5OQ+Via4RmuPwCS0=
+github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
+github.com/boltdb/bolt v1.3.1 h1:JQmyP4ZBrce+ZQu0dY660FMfatumYDLun9hBCUVIkF4=
+github.com/boltdb/bolt v1.3.1/go.mod h1:clJnj/oiGkjum5o1McbSZDSLxVThjynRyGBgiAx27Ps=
+github.com/coreos/bbolt v1.3.0 h1:HIgH5xUWXT914HCI671AxuTTqjj64UOFr7pHn48LUTI=
+github.com/coreos/bbolt v1.3.0/go.mod h1:iRUV2dpdMOn7Bo10OQBFzIJO9kkE559Wcmn+qkEiiKk=
+github.com/coreos/etcd v3.3.9+incompatible h1:/pWnp1yEff0z+vBEOBFLZZ22Ux5xoVozEe7X0VFyRNo=
+github.com/coreos/etcd v3.3.9+incompatible/go.mod h1:uF7uidLiAD3TWHmW31ZFd/JWoc32PjwdhPthX9715RE=
+github.com/coreos/go-semver v0.2.0 h1:3Jm3tLmsgAYcjC+4Up7hJrFBPr+n7rAqYeSw/SZazuY=
+github.com/coreos/go-semver v0.2.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk=
+github.com/coreos/go-systemd v0.0.0-20180705093442-88bfeed483d3 h1:h/wTyTK7VVFaSLpGFKLPkEYiWuloHpStKd30EZIaL9I=
+github.com/coreos/go-systemd v0.0.0-20180705093442-88bfeed483d3/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
+github.com/coreos/pkg v0.0.0-20180108230652-97fdf19511ea h1:n2Ltr3SrfQlf/9nOna1DoGKxLx3qTSI8Ttl6Xrqp6mw=
+github.com/coreos/pkg v0.0.0-20180108230652-97fdf19511ea/go.mod h1:E3G3o1h8I7cfcXa63jLwjI0eiQQMgzzUDFVpN/nH/eA=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
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--- a/main.go
+++ b/main.go
@ -0,0 +1,42 @@
+/*
+Copyright 2016 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package main
+
+import (
+	"flag"
+	"os"
+	"runtime"
+
+	"github.com/mikkeloscar/kube-metrics-adapter/pkg/server"
+	"k8s.io/apimachinery/pkg/util/wait"
+	"k8s.io/apiserver/pkg/util/logs"
+)
+
+func main() {
+	logs.InitLogs()
+	defer logs.FlushLogs()
+
+	if len(os.Getenv("GOMAXPROCS")) == 0 {
+		runtime.GOMAXPROCS(runtime.NumCPU())
+	}
+
+	cmd := server.NewCommandStartAdapterServer(wait.NeverStop)
+	cmd.Flags().AddGoFlagSet(flag.CommandLine)
+	if err := cmd.Execute(); err != nil {
+		panic(err)
+	}
+}
--- a/pkg/collector/aws_collector.go
+++ b/pkg/collector/aws_collector.go
@ -0,0 +1,128 @@
+package collector
+
+import (
+	"fmt"
+	"strconv"
+	"time"
+
+	"github.com/aws/aws-sdk-go/aws"
+	"github.com/aws/aws-sdk-go/aws/session"
+	"github.com/aws/aws-sdk-go/service/sqs"
+	"github.com/aws/aws-sdk-go/service/sqs/sqsiface"
+	autoscalingv2beta1 "k8s.io/api/autoscaling/v2beta1"
+	"k8s.io/apimachinery/pkg/api/resource"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/metrics/pkg/apis/external_metrics"
+)
+
+const (
+	AWSSQSQueueLengthMetric = "sqs-queue-length"
+	sqsQueueNameLabelKey    = "queue-name"
+	sqsQueueRegionLabelKey  = "region"
+)
+
+type AWSCollectorPlugin struct {
+	sessions map[string]*session.Session
+}
+
+func NewAWSCollectorPlugin(sessions map[string]*session.Session) *AWSCollectorPlugin {
+	return &AWSCollectorPlugin{
+		sessions: sessions,
+	}
+}
+
+// NewCollector initializes a new skipper collector from the specified HPA.
+func (c *AWSCollectorPlugin) NewCollector(hpa *autoscalingv2beta1.HorizontalPodAutoscaler, config *MetricConfig, interval time.Duration) (Collector, error) {
+	switch config.Name {
+	case AWSSQSQueueLengthMetric:
+		return NewAWSSQSCollector(c.sessions, config, interval)
+	}
+
+	return nil, fmt.Errorf("metric '%s' not supported", config.Name)
+}
+
+type AWSSQSCollector struct {
+	sqs        sqsiface.SQSAPI
+	interval   time.Duration
+	region     string
+	queueURL   string
+	queueName  string
+	labels     map[string]string
+	metricName string
+	metricType autoscalingv2beta1.MetricSourceType
+}
+
+func NewAWSSQSCollector(sessions map[string]*session.Session, config *MetricConfig, interval time.Duration) (*AWSSQSCollector, error) {
+
+	name, ok := config.Labels[sqsQueueNameLabelKey]
+	if !ok {
+		return nil, fmt.Errorf("sqs queue name not specified on metric")
+	}
+	region, ok := config.Labels[sqsQueueRegionLabelKey]
+	if !ok {
+		return nil, fmt.Errorf("sqs queue region is not specified on metric")
+	}
+
+	session, ok := sessions[region]
+	if !ok {
+		return nil, fmt.Errorf("the metric region: %s is not configured", region)
+	}
+
+	service := sqs.New(session)
+	params := &sqs.GetQueueUrlInput{
+		QueueName: aws.String(name),
+	}
+
+	resp, err := service.GetQueueUrl(params)
+	if err != nil {
+		return nil, fmt.Errorf("failed to get queue URL for queue '%s': %v", name, err)
+	}
+
+	return &AWSSQSCollector{
+		sqs:        service,
+		interval:   interval,
+		queueURL:   aws.StringValue(resp.QueueUrl),
+		queueName:  name,
+		metricName: config.Name,
+		metricType: config.Type,
+		labels:     config.Labels,
+	}, nil
+}
+
+func (c *AWSSQSCollector) GetMetrics() ([]CollectedMetric, error) {
+	params := &sqs.GetQueueAttributesInput{
+		QueueUrl:       aws.String(c.queueURL),
+		AttributeNames: aws.StringSlice([]string{sqs.QueueAttributeNameApproximateNumberOfMessages}),
+	}
+
+	resp, err := c.sqs.GetQueueAttributes(params)
+	if err != nil {
+		return nil, err
+	}
+
+	if v, ok := resp.Attributes[sqs.QueueAttributeNameApproximateNumberOfMessages]; ok {
+		i, err := strconv.Atoi(aws.StringValue(v))
+		if err != nil {
+			return nil, err
+		}
+
+		metricValue := CollectedMetric{
+			Type: c.metricType,
+			External: external_metrics.ExternalMetricValue{
+				MetricName:   c.metricName,
+				MetricLabels: c.labels,
+				Timestamp:    metav1.Time{Time: time.Now().UTC()},
+				Value:        *resource.NewQuantity(int64(i), resource.DecimalSI),
+			},
+		}
+
+		return []CollectedMetric{metricValue}, nil
+	}
+
+	return nil, fmt.Errorf("failed to get queue length for '%s'", c.queueName)
+}
+
+// Interval returns the interval at which the collector should run.
+func (c *AWSSQSCollector) Interval() time.Duration {
+	return c.interval
+}
--- a/Show More
+++ b/Show More