groups:
- name: apache-solr
  rules:
  - alert: ApacheSolrZookeeperChangeInEnsembleSize
    annotations:
      description: Zookeeper host {{$labels.zk_host}} has had an ensemble change of
        {{ printf "%.0f" $value }} over the last 5 minutes
      summary: Changes in the ZooKeeper ensemble size can affect the stability and
        performance of the cluster.
    expr: |
      changes(solr_zookeeper_ensemble_size[5m]) > 0
    for: 5m
    labels:
      severity: warning
  - alert: ApacheSolrHighCPUUsageCritical
    annotations:
      description: '{{$labels.instance}} on cluster {{$labels.solr_cluster}} has had
        a system CPU load of {{ printf "%.0f" $value }}%, which is above the threshold
        of 85.'
      summary: High CPU load can indicate that Solr nodes are under heavy load, potentially
        impacting performance.
    expr: |
      100 * sum without (base_url, item) (avg_over_time(solr_metrics_jvm_os_cpu_load{item="systemCpuLoad"}[5m])) > 85
    for: 5m
    labels:
      severity: critical
  - alert: ApacheSolrHighCPUUsageWarning
    annotations:
      description: '{{$labels.instance}} on cluster {{$labels.solr_cluster}} has had
        a system CPU load of {{ printf "%.0f" $value }}%, which is above the threshold
        of 75.'
      summary: High CPU load can indicate that Solr nodes are under heavy load, potentially
        impacting performance.
    expr: |
      100 * sum without (base_url, item) (avg_over_time(solr_metrics_jvm_os_cpu_load{item="systemCpuLoad"}[5m])) > 75
    for: 5m
    labels:
      severity: warning
  - alert: ApacheSolrHighHeapMemoryUsageCritical
    annotations:
      description: |
        {{$labels.instance}} on cluster {{$labels.solr_cluster}} has had high memory usage of {{ printf "%.0f" $value }}%, which is above the thresold of 75.
      summary: High heap memory usage can lead to garbage collection issues, out-of-memory
        errors, and overall system instability.
    expr: |
      100 * sum without(item, base_url)(solr_metrics_jvm_memory_heap_bytes{item="used"}) / clamp_min(sum without(item, base_url)(solr_metrics_jvm_memory_heap_bytes{item="max"}), 1) > 75
    for: 5m
    labels:
      severity: critical
  - alert: ApacheSolrHighHeapMemoryUsageWarning
    annotations:
      description: |
        {{$labels.instance}} on cluster {{$labels.solr_cluster}} has had high memory usage of {{ printf "%.0f" $value }}%, which is above the thresold of 85.
      summary: High heap memory usage can lead to garbage collection issues, out-of-memory
        errors, and overall system instability.
    expr: |
      100 * sum without(item, base_url)(solr_metrics_jvm_memory_heap_bytes{item="used"}) / clamp_min(sum without(item, base_url)(solr_metrics_jvm_memory_heap_bytes{item="max"}), 1) > 85
    for: 5m
    labels:
      severity: warning
  - alert: ApacheSolrLowCacheHitRatio
    annotations:
      description: |
        {{$labels.instance}} on cluster {{$labels.solr_cluster}} has had a low cache hit ratio of {{ printf "%.0f" $value }}% on core {{$labels.core}} of type {{$labels.type}}, which is under the threshold of 75.
      summary: Low cache hit ratios can lead to increased disk I/O and slower query
        response times.
    expr: |
      100 * sum without(base_url, category, collection, item, replica, shard) (solr_metrics_core_searcher_cache_ratio{item="hitratio", type=~"documentCache|filterCache|queryResultCache"}) < 75
    for: 10m
    labels:
      severity: warning
  - alert: ApacheSolrHighCoreErrors
    annotations:
      description: |
        {{$labels.instance}} on cluster {{$labels.solr_cluster}} has had a high amount of core errors {{ printf "%.0f" $value }}% on core {{$labels.core}}, which is above the threshold of 15.
      summary: A spike in core errors can indicate serious issues at the core level,
        affecting data integrity and availability.
    expr: |
      100 * sum without(base_url, category, collection, handler, replica, shard) (increase(solr_metrics_core_errors_total[10m]) / clamp_min(avg_over_time(solr_metrics_core_errors_total[10m]), 1)) > 15
    for: 10m
    labels:
      severity: warning
  - alert: ApacheSolrHighDocumentIndexing
    annotations:
      description: |
        {{$labels.instance}} on cluster {{$labels.solr_cluster}} has had a high document indexing value of {{ printf "%.0f" $value }}% on core {{$labels.core}}, which is above the threshold of 30.
      summary: A sudden spike in document indexing could indicate unintended or malicious
        bulk updates.
    expr: |
      100 * sum without(base_url, category, collection, handler, replica, shard) (increase(solr_metrics_core_update_handler_adds_total[15m]) / clamp_min(avg_over_time(solr_metrics_core_update_handler_adds_total[15m]), 1)) > 30
    for: 15m
    labels:
      severity: warning