groups:
  - name: couchdb-alerts
    rules:
      - alert: CouchDBNodeDown
        expr: expr: couchdb_httpd_node_up == 0 or couchdb_httpd_up == 0
        for: 2m
        labels:
          severity: critical
        annotations:
          summary: "CouchDB node down"
          description: "CouchDB node is not responding (node_up metric is 0) for more than 2 minutes."

      - alert: CouchDBAtomMemoryHigh
        expr: couchdb_erlang_memory_atom_used > 0.9 * couchdb_erlang_memory_atom
        for: 5m
        labels:
          severity: critical
        annotations:
          summary: "CouchDB atom memory usage critical"
          description: "Atom memory usage is above 90% of limit."

      - alert: CouchDBOpenDatabasesCritical
        expr: couchdb_httpd_open_databases > 0.9 * 1000
        for: 5m
        labels:
          severity: critical
        annotations:
          summary: "CouchDB open databases critical"
          description: "Number of open databases exceeds 90% of node capacity."

      - alert: CouchDBOpenOSFilesCritical
        expr: couchdb_httpd_open_os_files > 0.9 * 65535
        for: 5m
        labels:
          severity: critical
        annotations:
          summary: "CouchDB open OS files critical"
          description: "CouchDB is using more than 90% of allowed OS file descriptors, may fail to open new files."

      - alert: CouchDB5xxErrorsHigh
        expr: rate(couchdb_httpd_status_codes{code=~"5.."}[5m]) / rate(couchdb_httpd_requests[5m]) > 0.05
        for: 5m
        labels:
          severity: critical
        annotations:
          summary: "CouchDB 5xx error ratio high"
          description: "More than 5% of HTTP requests are returning 5xx errors."

      - alert: CouchDBTemporaryViewReadsCritical
        expr: rate(couchdb_httpd_temporary_view_reads[5m]) > 100
        for: 5m
        labels:
          severity: critical
        annotations:
          summary: "CouchDB temporary view read rate critical"
          description: "Temporary view read rate exceeds 100 reads/sec, high risk of performance degradation."

      - alert: CouchDBMangoTooManyDocsScanned
        expr: rate(couchdb_mango_too_many_docs_scanned[5m]) > 50
        for: 5m
        labels:
          severity: warning
        annotations:
          summary: "CouchDB Mango queries scanning too many docs"
          description: "Some Mango queries are scanning too many documents, consider adding indexes."

      - alert: CouchDBMangoInvalidIndexQueries
        expr: rate(couchdb_mango_query_invalid_index[5m]) > 5
        for: 5m
        labels:
          severity: warning
        annotations:
          summary: "CouchDB Mango queries failed due to invalid index"
          description: "Some Mango queries failed to execute because the index was missing or invalid."

      - alert: CouchDBMangoDocsExaminedHigh
        expr: rate(couchdb_mango_docs_examined[5m]) > 1000
        for: 5m
        labels:
          severity: warning
        annotations:
          summary: "CouchDB Mango docs examined high"
          description: "High number of documents examined per Mango queries, consider indexing."

      - alert: CouchDBReplicatorManagerDeaths
        expr: increase(couchdb_replicator_changes_manager_deaths[5m]) > 0
        for: 1m
        labels:
          severity: critical
        annotations:
          summary: "CouchDB Replicator manager died"
          description: "Replication manager process has crashed."

      - alert: CouchDBReplicatorQueueDeaths
        expr: increase(couchdb_replicator_changes_queue_deaths[5m]) > 0
        for: 1m
        labels:
          severity: critical
        annotations:
          summary: "CouchDB Replicator queue process died"
          description: "Replication queue process has crashed."

      - alert: CouchDBReplicatorReaderDeaths
        expr: increase(couchdb_replicator_changes_reader_deaths[5m]) > 0
        for: 1m
        labels:
          severity: critical
        annotations:
          summary: "CouchDB Replicator reader process died"
          description: "Replication reader process has crashed."

      - alert: CouchDBReplicatorFailedStarts
        expr: increase(couchdb_replicator_failed_starts[5m]) > 0
        for: 1m
        labels:
          severity: critical
        annotations:
          summary: "CouchDB Replicator failed to start"
          description: "One or more replication tasks failed to start."

      - alert: CouchDBReplicatorClusterUnstable
        expr: couchdb_replicator_cluster_is_stable == 0
        for: 2m
        labels:
          severity: critical
        annotations:
          summary: "CouchDB replication cluster unstable"
          description: "The replication cluster is unstable, replication may be interrupted."

      - alert: CouchDBReplicatorChangesReadFailures
        expr: increase(couchdb_replicator_changes_read_failures[5m]) > 5
        for: 5m
        labels:
          severity: warning
        annotations:
          summary: "CouchDB replication read failures"
          description: "Replication changes feed has failed reads more than 5 times in 5 minutes."

      - alert: CouchDBOpenFDsHigh
        expr: process_open_fds / process_max_fds > 0.85
        for: 5m
        labels:
          severity: warning
        annotations:
          summary: "CouchDB file descriptors high"
          description: "Process is using more than 85% of allowed file descriptors."

      - alert: CouchDBProcessRestarted
        expr: changes(process_start_time_seconds[1h]) > 0
        for: 1m
        labels:
          severity: critical
        annotations:
          summary: "CouchDB process restarted"
          description: "CouchDB process has restarted recently."

      - alert: CouchDBCriticalLogs
        expr: increase(couchdb_server_couch_log{level=~"error|critical"}[5m]) > 0
        for: 1m
        labels:
          severity: critical
        annotations:
          summary: "CouchDB critical log entries"
          description: "Critical or error log entries detected in the last 5 minutes."