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Creating Custom Metrics on Prometheus Adapter(3.0)
Creating Custom Metrics on Prometheus Adapter(3.0)
Custom Metrics, Scaling, Prometheus Adapter Examples
The Prometheus adapter is what makes Prometheus metrics available as metrics in Kubernetes. Using the adapter together with the metrics exposed by
it is possible to, for example, scale deployments based on these custom metrics.Creating New Metrics using the Adapter
Sometimes you need to take a metrics value and create a new metric based on the original one. For example if you want to do a sliding window or defining a new metric that shows the rate or rates from another metric.
The default
Adapter metric rule definitions used during installation are the following:- seriesQuery: '{__name__=~"^com_digitalroute.*"}' resources: overrides: namespace: {resource: "namespace"} pod: {resource: "pod"} name: matches: ^(.*) as: "" metricsQuery: sum(<<.Series>>{<<.LabelMatchers>>}) by (<<.GroupBy>>)
This definition makes all metrics starting with com_digitalroute available as “pod” metrics in Kubernetes.
Below is an example for creating a new custom metric. We will be using the Workflow Throughput MIM value found in
to generate our custom metrics to publish to kubernetes.- seriesQuery: '{__name__=~"com_digitalroute_wf_Workflow_Workflow_Throughput"}' resources: overrides: namespace: {resource: "namespace"} pod: {resource: "pod"} name: matches: ^(.*) as: "workflows_throughput_avg" metricsQuery: sum(avg_over_time(com_digitalroute_wf_Workflow_Workflow_Throughput[5m])) by (<<.GroupBy>>)
You can read more about creating metrics via the adapter configuration from https://github.com/kubernetes-sigs/prometheus-adapter.
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