docs: update metrics info for site

[googs1025]

update metrics info for site

fix: #613

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[googs1025]

Prometheus Metrics

JobSet exposes prometheus metrics to monitor the health
of the controller.

Installation Examples

The following example show how to install the Prometheus Operator for JobSet system.

JobSet controller health

Use the following metrics to monitor the health of the jobset controller:

Metric name	Type	Description	Labels
controller_runtime_reconcile_errors_total	Counter	The total number of reconciliation errors encountered by each controller.	controller: name of controller (i.e. use value jobset to obtain metrics for jobset controller)
controller_runtime_reconcile_time_seconds	Histogram	The latency of a reconciliation attempt in seconds.	controller: name of controller (i.e. use value jobset to obtain metrics for jobset controller)

JobSet metrics

Use the following metrics to monitor the health of the jobsets created by the jobset controller:

Metric name	Type	Description	Labels
jobset_failed_total	Counter	The total number of failed JobSets.	jobset_name: name of jobset
jobset_completed_total	Counter	The total number of completed JobSets.	jobset_name: name of jobset

[googs1025]

In order to facilitate reading, I directly paste the markdown here.

[danielvegamyhre]

/lgtm
/approve

Thanks for keeping the docs up to date!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: danielvegamyhre, googs1025

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