Prow Exporter

This is a Prometheus exporter that provides metrics about Prow jobs.

This is just an experiment and some or all of the metrics might make no sense at all.

Usage

Use the Kubernetes manifests in contrib/kubernetes/ to deploy the exporter. Deploy it into the same cluster as Prow and into the same namespace please.

Mode of Operation

The exporter makes the following assumptions:

Prow jobs are archived after a certain timeframe, so it's impossible and undesirable to get a 100% complete picture of all jobs ever.
Prow jobs exist for at least 2 days after they completed.

The exporter therefore works like this:

Metrics are reset every night at midnight UTC. This means that on Monday, the exporter will report metrics only for jobs that have be running on or completed during Monday. At midnight in the night to Tuesday, metrics are reset. Metrics like prow_job_time_spent_seconds are a counter, because Prometheus can internally deal with counters being reset to 0. This is the main reason for the nightly reset, to have a defined point where we return to 0.

Metrics

prow_exporter_job_cache_size (gauge) - number of Prow jobs in the in-memory cache of the exporter (no labels)
prow_running_jobs (gauge) - number of running jobs per job name, labels prowjob, type, cluster, org, repo, pr
prow_job_time_spent_seconds (counter) - total time spent on a Prow job, in seconds., labels prowjob, type, cluster, org, repo, pr
prow_job_states (counter) - number of Prow jobs per state, labels prowjob, state, type, cluster, org, repo, pr
prow_job_durations_seconds (histogram) - histogram of the Prow jobd urations in seconds, labels prowjob, state, type, cluster, org, repo, pr

License

xrstf/prow_exporter

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