Indexing¶

Kube-burner can collect metrics and alerts from prometheus and from measurements and send them to the configured indexers.

Metrics endpoints¶

The logic to configure metric collection and indexing is established by the metricsEndpoints field of the configuration file, this field is a list of objects with the following structure:

Field	Description	Example
`endpoint`	Define the prometheus endpoint to scrape	`https://prom.my-domain.com`
`username`	Prometheus username (Basic auth)	`username`
`password`	Prometheus password (Basic auth)	`topSecret`
`token`	Prometheus bearer token (Bearer auth)	`yourTokenDefinition`
`step`	Prometheus step size, used when scraping it, by default `30s`	`1m`
`skipTLSVerify`	Skip TLS certificate verification, `true` by default	`true`
`metrics`	List of metrics files	`[metrics.yml, more-metrics.yml]`
`alerts`	List of alerts files	`[alerts.yml, more-alerts.yml]`
`indexer`	Indexer configuration	indexers
`alias`	Indexer alias, an arbitrary string required to send measurement results to an specific indexer	`my-indexer`

Note

Info about how to configure metrics-profiles and alerts-profiles

Indexers¶

Configured by the indexer field, it defines an indexer for the Prometheus endpoint, making all collected metrics to be indexed in it. Depending on the indexer, different configuration parameters need to be specified. The type of indexer is configured by the field type

Option	Description	Supported values
`type`	Type of indexer	`elastic`, `opensearch`, `local`

Example¶

An example of how the metricsEndpoints section would look like in the configuration is:

metricsEndpoints:
  - endpoint: http://localhost:9090
    alias: os-indexing
    alerts:
    - alert-profile.yaml
  - endpoint: https://remote-endpoint:9090
    metrics:
    - metrics-profile.yaml
    indexer:
      type: local
      metricsDirectory: my-metrics

In the example above, two endpoints are defined, the first will be used to scrape for the alerts defined in the file alert-profile.yaml and the second one will be used to scrape the metrics defined in metrics-profile.yaml, these metrics will be indexed by the configured indexer.

Info

Configuring an indexer in an endpoint is only required when any metrics profile is configured

Elastic/OpenSearch¶

Send collected documents to Elasticsearch7 or OpenSearch instances.

The elastic or opensearch indexer can be configured by the parameters below:

Option	Description	Type	Default
`esServers`	List of Elasticsearch or OpenSearch URLs	List	[]
`defaultIndex`	Default index to send the Prometheus metrics into	String	""
`insecureSkipVerify`	TLS certificate verification	Boolean	false

OpenSearch is backwards compatible with Elasticsearch and kube-burner does not use any version checks. Therefore, kube-burner with OpenSearch indexing should work as expected.

Info

It is possible to index documents in an authenticated Elasticsearch or OpenSearch instance using the notation http(s)://[username]:[password]@[address]:[port] in the esServers parameter.

Local¶

This indexer writes collected metrics to local files.

The local indexer can be configured by the parameters below:

Option	Description	Type	Default
`metricsDirectory`	Collected metric will be dumped here.	String	collected-metrics
`createTarball`	Create metrics tarball	Boolean	false
`tarballName`	Name of the metrics tarball	String	kube-burner-metrics.tgz

Job Summary¶

When an indexer is configured, a document holding the job summary is indexed at the end of the job. This is useful to identify the parameters the job was executed with. It also contains the timestamps of the execution phase (timestamp and endTimestamp) as well as the cleanup phase (cleanupTimestamp and cleanupEndTimestamp).

This document looks like:

{
  "timestamp": "2023-08-29T00:17:27.942960538Z",
  "endTimestamp": "2023-08-29T00:18:15.817272025Z",
  "uuid": "83bfcb20-54f1-43f4-b2ad-ad04c2f4fd16",
  "metricName": "jobSummary",
  "elapsedTime": 48,
  "cleanupTimestamp": "2023-08-29T00:18:18.015107794Z",
  "cleanupEndTimestamp": "2023-08-29T00:18:49.014541929Z",
  "metricName": "jobSummary",
  "elapsedTime": 8.768932955,
  "jobConfig": {
    "jobIterations": 10,
    "jobIterationDelay": 0,
    "jobPause": 0,
    "name": "kubelet-density",
    "jobType": "create",
    "qps": 5,
    "burst": 5,
    "namespace": "kubelet-density",
    "maxWaitTimeout": 43200000000000,
    "waitForDeletion": true,
    "podWait": false,
    "waitWhenFinished": true,
    "cleanup": true,
    "namespacedIterations": false,
    "verifyObjects": true,
    "errorOnVerify": false
  }
}

Metric exporting & importing¶

When using the local indexer, it is possible to dump all of the collected metrics into a tarball, which you can import later. This is useful in disconnected environments, where kube-burner does not have direct access to an Elasticsearch instance. Metrics exporting can be configured by createTarball field of the indexer config as noted in the local indexer.

The metric exporting feature is available through the init and index subcommands. Once you enabled it, a tarball (kube-burner-metrics-<timestamp>.tgz) containing all metrics is generated in the current working directory. This tarball can be imported and indexed by kube-burner with the import subcommand. For example:

$ kube-burner/bin/kube-burner import --config kubelet-config.yml --tarball kube-burner-metrics-1624441857.tgz
INFO[2021-06-23 11:39:40] 📁 Creating indexer: elastic
INFO[2021-06-23 11:39:42] Importing tarball kube-burner-metrics-1624441857.tgz
INFO[2021-06-23 11:39:42] Importing metrics from doc.json
INFO[2021-06-23 11:39:43] Indexing [1] documents in kube-burner
INFO[2021-06-23 11:39:43] Successfully indexed [1] documents in 208ms in kube-burner

Scraping from multiple endpoints¶

It is possible to scrape from multiple Prometheus endpoints and send the results to the target indexer with the init and index subcommands. This feature is configured by the flag --metrics-endpoint, which points to a YAML file with the required configuration.

A valid file provided to the --metrics-endpoint looks like this:

- endpoint: http://localhost:9090 # This is one of the Prometheus endpoints
  token: <token> # Authentication token
  metrics: [metrics.yaml] # Metrics profiles to use for this endpoint
  indexer:
    - type: local
- endpoint: http://remotehost:9090 # Another Prometheus endpoint
  token: <token>
  alerts: [alerts.yaml] # Alert profile, when metrics is not defined, defining an indexer is optional

Note

The configuration provided by the --metrics-endpoint flag has precedence over the parameters specified in the config file.