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Add documentation regarding hostname-rps collector to readme

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Signed-off-by: Lucas Thiesen <lucas.thiesen@zalando.de>
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Lucas Thiesen
2023-05-02 20:06:49 +02:00
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@ -402,6 +402,51 @@ the `backend` label under `matchLabels` for the metric. The ingress annotation
where the backend weights can be obtained can be specified through the flag where the backend weights can be obtained can be specified through the flag
`--skipper-backends-annotation`. `--skipper-backends-annotation`.
## Hostname RPS collector
The Hostname collector, like Skipper collector, is a simple wrapper around the Prometheus collector to
make it easy to define an HPA for scaling based on the RPS measured for a given hostname. When
[skipper](https://github.com/zalando/skipper) is used as the ingress
implementation in your cluster everything should work automatically, in case another reverse proxy is used as ingress, like [Nginx](https://github.com/kubernetes/ingress-nginx) for example, its necessary to configure which prometheus metric should be used through `--hostname-rps-metric-name <metric-name>` flag. Assuming `skipper-ingress` is being used or the appropriate metric name is passed using the flag mentioned previously this collector provides the correct Prometheus queries out of the
box so users don't have to define those manually.
### Supported metrics
| Metric | Description | Type | Kind | K8s Versions |
| ------------ | -------------- | ------- | -- | -- |
| `hostname-rps` | Scale based on requests per second for a certain hostname. | External | | `>=1.12` |
### Example: External Metric
This is an example of an HPA that will scale based on `hostname-rps` for the RPS measured in the hostname called `www.example.com`.
```yaml
apiVersion: autoscaling/v2beta2
kind: HorizontalPodAutoscaler
metadata:
name: myapp-hpa
annotations:
metric-config.external.example-rps.hostname-rps/hostname: www.example.com
spec:
scaleTargetRef:
apiVersion: apps/v1
kind: Deployment
name: custom-metrics-consumer
minReplicas: 1
maxReplicas: 10
metrics:
- type: External
external:
metric:
name: example-rps
selector:
matchLabels:
type: hostname-rps
target:
type: AverageValue
averageValue: "42"
```
## InfluxDB collector ## InfluxDB collector
The InfluxDB collector maps [Flux](https://github.com/influxdata/flux) queries to metrics that can be used for scaling. The InfluxDB collector maps [Flux](https://github.com/influxdata/flux) queries to metrics that can be used for scaling.