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Chapter 6. Using metering with OpenShift Serverless

Important

You are viewing documentation for a release of Red Hat OpenShift Serverless that is no longer supported. Red Hat OpenShift Serverless is currently supported on OpenShift Container Platform 4.3 and newer.

As a cluster administrator, you can use metering to analyze what is happening in your OpenShift Serverless cluster.

For more information about metering on OpenShift Container Platform, see About metering.

6.1. Installing metering
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For information about installing metering on OpenShift Container Platform, see Installing Metering.

6.2. Datasources for Knative Serving metering
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The following ReportDataSources are examples of how Knative Serving can be used with OpenShift Container Platform metering.

6.2.1. Datasource for CPU usage in Knative Serving
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This datasource provides the accumulated CPU seconds used per Knative service over the report time period.

YAML file

apiVersion: metering.openshift.io/v1
kind: ReportDataSource
metadata:
  name: knative-service-cpu-usage
spec:
  prometheusMetricsImporter:
    query: >
      sum
          by(namespace,
             label_serving_knative_dev_service,
             label_serving_knative_dev_revision)
          (
            label_replace(rate(container_cpu_usage_seconds_total{container_name!="POD",container_name!="",pod_name!=""}[1m]), "pod", "$1", "pod_name", "(.*)")
            *
            on(pod, namespace)
            group_left(label_serving_knative_dev_service, label_serving_knative_dev_revision)
            kube_pod_labels{label_serving_knative_dev_service!=""}
          )
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6.2.2. Datasource for memory usage in Knative Serving
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This datasource provides the average memory consumption per Knative service over the report time period.

YAML file

apiVersion: metering.openshift.io/v1
kind: ReportDataSource
metadata:
  name: knative-service-memory-usage
spec:
  prometheusMetricsImporter:
    query: >
      sum
          by(namespace,
             label_serving_knative_dev_service,
             label_serving_knative_dev_revision)
          (
            label_replace(container_memory_usage_bytes{container_name!="POD", container_name!="",pod_name!=""}, "pod", "$1", "pod_name", "(.*)")
            *
            on(pod, namespace)
            group_left(label_serving_knative_dev_service, label_serving_knative_dev_revision)
            kube_pod_labels{label_serving_knative_dev_service!=""}
          )
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6.2.3. Applying Datasources for Knative Serving metering
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You can apply the ReportDataSources by using the following command: 

$ oc apply -f <datasource-name>.yaml
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Example

$ oc apply -f knative-service-memory-usage.yaml
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6.3. Queries for Knative Serving metering
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The following ReportQuery resources reference the example DataSources provided.

6.3.1. Query for CPU usage in Knative Serving
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YAML file

apiVersion: metering.openshift.io/v1
kind: ReportQuery
metadata:
  name: knative-service-cpu-usage
spec:
  inputs:
  - name: ReportingStart
    type: time
  - name: ReportingEnd
    type: time
  - default: knative-service-cpu-usage
    name: KnativeServiceCpuUsageDataSource
    type: ReportDataSource
  columns:
  - name: period_start
    type: timestamp
    unit: date
  - name: period_end
    type: timestamp
    unit: date
  - name: namespace
    type: varchar
    unit: kubernetes_namespace
  - name: service
    type: varchar
  - name: data_start
    type: timestamp
    unit: date
  - name: data_end
    type: timestamp
    unit: date
  - name: service_cpu_seconds
    type: double
    unit: cpu_core_seconds
  query: |
    SELECT
      timestamp '{| default .Report.ReportingStart .Report.Inputs.ReportingStart| prestoTimestamp |}' AS period_start,
      timestamp '{| default .Report.ReportingEnd .Report.Inputs.ReportingEnd | prestoTimestamp |}' AS period_end,
      labels['namespace'] as project,
      labels['label_serving_knative_dev_service'] as service,
      min("timestamp") as data_start,
      max("timestamp") as data_end,
      sum(amount * "timeprecision") AS service_cpu_seconds
    FROM {| dataSourceTableName .Report.Inputs.KnativeServiceCpuUsageDataSource |}
    WHERE "timestamp" >= timestamp '{| default .Report.ReportingStart .Report.Inputs.ReportingStart | prestoTimestamp |}'
    AND "timestamp" < timestamp '{| default .Report.ReportingEnd .Report.Inputs.ReportingEnd | prestoTimestamp |}'
    GROUP BY labels['namespace'],labels['label_serving_knative_dev_service']
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6.3.2. Query for memory usage in Knative Serving
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YAML file

apiVersion: metering.openshift.io/v1
kind: ReportQuery
metadata:
  name: knative-service-memory-usage
spec:
  inputs:
  - name: ReportingStart
    type: time
  - name: ReportingEnd
    type: time
  - default: knative-service-memory-usage
    name: KnativeServiceMemoryUsageDataSource
    type: ReportDataSource
  columns:
  - name: period_start
    type: timestamp
    unit: date
  - name: period_end
    type: timestamp
    unit: date
  - name: namespace
    type: varchar
    unit: kubernetes_namespace
  - name: service
    type: varchar
  - name: data_start
    type: timestamp
    unit: date
  - name: data_end
    type: timestamp
    unit: date
  - name: service_usage_memory_byte_seconds
    type: double
    unit: byte_seconds
  query: |
    SELECT
      timestamp '{| default .Report.ReportingStart .Report.Inputs.ReportingStart| prestoTimestamp |}' AS period_start,
      timestamp '{| default .Report.ReportingEnd .Report.Inputs.ReportingEnd | prestoTimestamp |}' AS period_end,
      labels['namespace'] as project,
      labels['label_serving_knative_dev_service'] as service,
      min("timestamp") as data_start,
      max("timestamp") as data_end,
      sum(amount * "timeprecision") AS service_usage_memory_byte_seconds
    FROM {| dataSourceTableName .Report.Inputs.KnativeServiceMemoryUsageDataSource |}
    WHERE "timestamp" >= timestamp '{| default .Report.ReportingStart .Report.Inputs.ReportingStart | prestoTimestamp |}'
    AND "timestamp" < timestamp '{| default .Report.ReportingEnd .Report.Inputs.ReportingEnd | prestoTimestamp |}'
    GROUP BY labels['namespace'],labels['label_serving_knative_dev_service']
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6.3.3. Applying Queries for Knative Serving metering
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You can apply the ReportQuery by using the following command: 

$ oc apply -f <query-name>.yaml
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Example

$ oc apply -f knative-service-memory-usage.yaml
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6.4. Metering reports for Knative Serving
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You can run metering reports against Knative Serving by creating Report resources. Before you run a report, you must modify the input parameter within the Report resource to specify the start and end dates of the reporting period.

YAML file

apiVersion: metering.openshift.io/v1
kind: Report
metadata:
  name: knative-service-cpu-usage
spec:
  reportingStart: '2019-06-01T00:00:00Z'
1 

  reportingEnd: '2019-06-30T23:59:59Z'
2 

  query: knative-service-cpu-usage
3 

runImmediately: true
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1
Start date of the report, in ISO 8601 format.
2
End date of the report, in ISO 8601 format.
3
Either knative-service-cpu-usage for CPU usage report or knative-service-memory-usage for a memory usage report.

6.4.1. Running a metering report
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Once you have provided the input parameters, you can run the report using the command: 

$ oc apply -f <report-name>.yml
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You can then check the report as shown in the following example: 

$ kubectl get report

NAME                        QUERY                       SCHEDULE   RUNNING    FAILED   LAST REPORT TIME       AGE
knative-service-cpu-usage   knative-service-cpu-usage              Finished            2019-06-30T23:59:59Z   10h
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