[SOLR-10654] Expose Metrics in Prometheus format DIRECTLY from Solr

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 9.7
• Component/s: metrics
• Labels: pull-request-available
• Assignee: Unassigned
• Reporter: Keith Laban
• Created: 09/May/17 19:03
• Updated: 28/Oct/24 19:48
• Resolved: 12/Jul/24 21:03

Description

Expose metrics via a `wt=prometheus` response type.

Example scape_config in prometheus.yml:

scrape_configs:

  - job_name: 'solr'

    metrics_path: '/solr/admin/metrics'

    params:
      wt: ["prometheus"]

    static_configs:
      - targets: ['localhost:8983']

Rationale for having this despite the "Prometheus Exporter".  They have different strengths and weaknesses.

Issue Links

• relates to: SOLR-11795 Add Solr metrics exporter for Prometheus
• split to: SOLR-17368 TestPrometheusResponseWriter redesign
• links to: GitHub Pull Request #200
• links to: GitHub Pull Request #200
• links to: GitHub Pull Request #2405
• links to: GitHub Pull Request #2616
• links to: GitHub Pull Request #2620
• links to: GitHub Pull Request #2795