Monitoring with Prometheus and Grafana

<config>

  <rules>

    <ping>
      <lst name="request">
        <lst name="query">
          <str name="path">/admin/ping</str>
        </lst>
        <arr name="jsonQueries">
          <str>
            . as $object | $object |
            (if $object.status == "OK" then 1.0 else 0.0 end) as $value |
            {
              name         : "solr_ping",
              type         : "GAUGE",
              help         : "See following URL: https://solr.apache.org/guide/solr/latest/deployment-guide/ping.html",
              label_names  : [],
              label_values : [],
              value        : $value
            }
          </str>
        </arr>
      </lst>
    </ping>

    <metrics>
      <lst name="request">
        <lst name="query">
          <str name="path">/admin/metrics</str>
          <lst name="params">
            <str name="group">all</str>
            <str name="type">all</str>
            <str name="prefix"></str>
            <str name="property"></str>
          </lst>
        </lst>
        <arr name="jsonQueries">
          <!--
            jetty metrics
          -->
          <str>
            .metrics["solr.jetty"] | to_entries | .[] | select(.key | startswith("org.eclipse.jetty.server.handler.DefaultHandler")) | select(.key | endswith("xx-responses")) as $object |
            $object.key | split(".") | last | split("-") | first as $status |
            $object.value.count as $value |
            {
            name         : "solr_metrics_jetty_response_total",
            type         : "COUNTER",
            help         : "See following URL: https://solr.apache.org/guide/solr/latest/deployment-guide/metrics-reporting.html",
            label_names  : ["status"],
            label_values : [$status],
            value        : $value
            }
          </str>
...
        </arr>
      </lst>
    </metrics>

    <collections>
      <lst name="request">
        <lst name="query">
          <str name="path">/admin/collections</str>
          <lst name="params">
            <str name="action">CLUSTERSTATUS</str>
          </lst>
        </lst>
        <arr name="jsonQueries">
          <str>
            .cluster.live_nodes | length as $value|
            {
              name         : "solr_collections_live_nodes",
              type         : "GAUGE",
              help         : "See following URL: https://solr.apache.org/guide/solr/latest/deployment-guide/cluster-node-management.html#clusterstatus",
              label_names  : [],
              label_values : [],
              value        : $value
            }
          </str>
...
        </arr>
      </lst>
    </collections>

    <search>
      <lst name="request">
        <lst name="query">
          <str name="collection">collection1</str>
          <str name="path">/select</str>
          <lst name="params">
            <str name="q">*:*</str>
            <str name="start">0</str>
            <str name="rows">0</str>
            <str name="json.facet">
              {
                category: {
                  type: terms,
                  field: cat
                }
              }
            </str>
          </lst>
        </lst>
        <arr name="jsonQueries">
          <str>
            .facets.category.buckets[] as $object |
            $object.val as $term |
            $object.count as $value |
            {
              name         : "solr_facets_category",
              type         : "GAUGE",
              help         : "Category facets",
              label_names  : ["term"],
              label_values : [$term],
              value        : $value
            }
          </str>
        </arr>
      </lst>
    </search>

  </rules>

</config>

scrape_configs:
  - job_name: 'solr'
    static_configs:
      - targets: ['localhost:9854']