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CouchDB logoCouchDB Prometheus Alert Rules

24 Prometheus alerting rules for CouchDB.Exported via gesellix/couchdb-prometheus-exporter.These rules cover critical and warning conditions — copy and paste the YAML into your Prometheus configuration.

⚠️

Alert thresholds depend on the nature of your applications. Some queries may have arbitrary tolerance thresholds. Building an efficient monitoring platform takes time. 😉

2.15.CouchDB logogesellix/couchdb-prometheus-exporter(24 rules)

wget https://raw.githubusercontent.com/samber/awesome-prometheus-alerts/refs/heads/master/dist/rules/couchdb/gesellix-couchdb-prometheus-exporter.yml
critical

2.15.1.CouchDB node down

CouchDB node is not responding (node_up metric is 0) for more than 2 minutes

- alert: CouchdbNodeDown
  expr: 'couchdb_httpd_node_up == 0 or couchdb_httpd_up == 0'
  for: 2m
  labels:
    severity: critical
  annotations:
    summary: CouchDB node down (instance {{ $labels.instance }})
    description: "CouchDB node is not responding (node_up metric is 0) for more than 2 minutes\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"
critical

2.15.2.CouchDB atom memory usage critical

Atom memory usage is above 90% of limit

- alert: CouchdbAtomMemoryUsageCritical
  expr: 'couchdb_erlang_memory_atom_used > 0.9 * couchdb_erlang_memory_atom'
  for: 5m
  labels:
    severity: critical
  annotations:
    summary: CouchDB atom memory usage critical (instance {{ $labels.instance }})
    description: "Atom memory usage is above 90% of limit\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"
critical

2.15.3.CouchDB open OS files critical

CouchDB is using more than 90% of allowed OS file descriptors, may fail to open new files

  # Adjust 65535 to match your system's file descriptor limit (ulimit -n).
- alert: CouchdbOpenOsFilesCritical
  expr: 'couchdb_httpd_open_os_files > 0.9 * 65535'
  for: 5m
  labels:
    severity: critical
  annotations:
    summary: CouchDB open OS files critical (instance {{ $labels.instance }})
    description: "CouchDB is using more than 90% of allowed OS file descriptors, may fail to open new files\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"
warning

2.15.4.CouchDB file descriptors high

Process is using more than 85% of allowed file descriptors

- alert: CouchdbFileDescriptorsHigh
  expr: 'process_open_fds / process_max_fds > 0.85 and process_max_fds > 0'
  for: 5m
  labels:
    severity: warning
  annotations:
    summary: CouchDB file descriptors high (instance {{ $labels.instance }})
    description: "Process is using more than 85% of allowed file descriptors\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"
critical

2.15.5.CouchDB open databases critical

Number of open databases exceeds 90% of node capacity

  # The default max_dbs_open is 500. Adjust the threshold (currently 0.9 * 1000) to match your max_dbs_open setting.
- alert: CouchdbOpenDatabasesCritical
  expr: 'couchdb_httpd_open_databases > 0.9 * 1000'
  for: 5m
  labels:
    severity: critical
  annotations:
    summary: CouchDB open databases critical (instance {{ $labels.instance }})
    description: "Number of open databases exceeds 90% of node capacity\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"
critical

2.15.6.CouchDB 5xx error ratio high

More than 5% of HTTP requests are returning 5xx errors

- alert: Couchdb5xxErrorRatioHigh
  expr: 'rate(couchdb_httpd_status_codes{code=~"5.."}[5m]) / rate(couchdb_httpd_requests[5m]) > 0.05 and rate(couchdb_httpd_requests[5m]) > 0'
  for: 5m
  labels:
    severity: critical
  annotations:
    summary: CouchDB 5xx error ratio high (instance {{ $labels.instance }})
    description: "More than 5% of HTTP requests are returning 5xx errors\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"
critical

2.15.7.CouchDB temporary view read rate critical

Temporary view read rate exceeds 100 reads/sec, high risk of performance degradation

  # 100 reads/s is a rough default; depends on your application's query patterns — adjust based on your workload. Note temporary views are inherently inefficient in CouchDB regardless of rate; consider replacing them with permanent views.
- alert: CouchdbTemporaryViewReadRateCritical
  expr: 'rate(couchdb_httpd_temporary_view_reads[5m]) > 100'
  for: 5m
  labels:
    severity: critical
  annotations:
    summary: CouchDB temporary view read rate critical (instance {{ $labels.instance }})
    description: "Temporary view read rate exceeds 100 reads/sec, high risk of performance degradation\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"
critical

2.15.8.CouchDB Replicator manager died

Replication manager process has crashed

- alert: CouchdbReplicatorManagerDied
  expr: 'increase(couchdb_replicator_changes_manager_deaths[5m]) > 0'
  for: 1m
  labels:
    severity: critical
  annotations:
    summary: CouchDB Replicator manager died (instance {{ $labels.instance }})
    description: "Replication manager process has crashed\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"
critical

2.15.9.CouchDB Replicator queue process died

Replication queue process has crashed

- alert: CouchdbReplicatorQueueProcessDied
  expr: 'increase(couchdb_replicator_changes_queue_deaths[5m]) > 0'
  for: 1m
  labels:
    severity: critical
  annotations:
    summary: CouchDB Replicator queue process died (instance {{ $labels.instance }})
    description: "Replication queue process has crashed\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"
critical

2.15.10.CouchDB Replicator reader process died

Replication reader process has crashed

- alert: CouchdbReplicatorReaderProcessDied
  expr: 'increase(couchdb_replicator_changes_reader_deaths[5m]) > 0'
  for: 1m
  labels:
    severity: critical
  annotations:
    summary: CouchDB Replicator reader process died (instance {{ $labels.instance }})
    description: "Replication reader process has crashed\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"
critical

2.15.11.CouchDB Replicator failed to start

One or more replication tasks failed to start

- alert: CouchdbReplicatorFailedToStart
  expr: 'increase(couchdb_replicator_failed_starts[5m]) > 0'
  for: 1m
  labels:
    severity: critical
  annotations:
    summary: CouchDB Replicator failed to start (instance {{ $labels.instance }})
    description: "One or more replication tasks failed to start\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"
critical

2.15.12.CouchDB replication cluster unstable

The replication cluster is unstable, replication may be interrupted

- alert: CouchdbReplicationClusterUnstable
  expr: 'couchdb_replicator_cluster_is_stable == 0'
  for: 2m
  labels:
    severity: critical
  annotations:
    summary: CouchDB replication cluster unstable (instance {{ $labels.instance }})
    description: "The replication cluster is unstable, replication may be interrupted\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"
critical

2.15.13.CouchDB critical log entries

Critical or error log entries detected in the last 5 minutes

- alert: CouchdbCriticalLogEntries
  expr: 'increase(couchdb_server_couch_log{level=~"error|critical"}[5m]) > 5'
  for: 1m
  labels:
    severity: critical
  annotations:
    summary: CouchDB critical log entries (instance {{ $labels.instance }})
    description: "Critical or error log entries detected in the last 5 minutes\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"
critical

2.15.14.CouchDB Replicator jobs crashing

Replicator jobs are crashing, indicating replication tasks are failing unexpectedly.

- alert: CouchdbReplicatorJobsCrashing
  expr: 'increase(couchdb_replicator_jobs{metric="crashes"}[5m]) > 0'
  for: 1m
  labels:
    severity: critical
  annotations:
    summary: CouchDB Replicator jobs crashing (instance {{ $labels.instance }})
    description: "Replicator jobs are crashing, indicating replication tasks are failing unexpectedly.\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"
critical

2.15.15.CouchDB Replicator connection owner crashing

Replicator HTTP connection owner processes are crashing, which can disrupt replication.

- alert: CouchdbReplicatorConnectionOwnerCrashing
  expr: 'increase(couchdb_replicator_connections{metric="owner_crashes"}[5m]) > 0'
  for: 1m
  labels:
    severity: critical
  annotations:
    summary: CouchDB Replicator connection owner crashing (instance {{ $labels.instance }})
    description: "Replicator HTTP connection owner processes are crashing, which can disrupt replication.\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"
critical

2.15.16.CouchDB Replicator connection worker crashing

Replicator HTTP connection worker processes are crashing, which can disrupt replication.

- alert: CouchdbReplicatorConnectionWorkerCrashing
  expr: 'increase(couchdb_replicator_connections{metric="worker_crashes"}[5m]) > 0'
  for: 1m
  labels:
    severity: critical
  annotations:
    summary: CouchDB Replicator connection worker crashing (instance {{ $labels.instance }})
    description: "Replicator HTTP connection worker processes are crashing, which can disrupt replication.\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"
critical

2.15.17.CouchDB request latency critical

Average CouchDB request time is above 1000ms, indicating severe performance degradation.

  # 1000ms threshold is a rough default; normal request latency depends on your query complexity and dataset size — adjust based on your baseline.
- alert: CouchdbRequestLatencyCritical
  expr: 'couchdb_httpd_request_time{metric="ArithmeticMean"} > 1000'
  for: 5m
  labels:
    severity: critical
  annotations:
    summary: CouchDB request latency critical (instance {{ $labels.instance }})
    description: "Average CouchDB request time is above 1000ms, indicating severe performance degradation.\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"
warning

2.15.18.CouchDB Mango queries scanning too many docs

Some Mango queries are scanning too many documents, consider adding indexes

  # 50/s is a rough default; depends on your query patterns and dataset size — adjust based on your workload, or add indexes to reduce full scans.
- alert: CouchdbMangoQueriesScanningTooManyDocs
  expr: 'rate(couchdb_mango_too_many_docs_scanned[5m]) > 50'
  for: 5m
  labels:
    severity: warning
  annotations:
    summary: CouchDB Mango queries scanning too many docs (instance {{ $labels.instance }})
    description: "Some Mango queries are scanning too many documents, consider adding indexes\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"
warning

2.15.19.CouchDB Mango queries failed due to invalid index

Some Mango queries failed to execute because the index was missing or invalid

- alert: CouchdbMangoQueriesFailedDueToInvalidIndex
  expr: 'rate(couchdb_mango_query_invalid_index[5m]) > 5'
  for: 5m
  labels:
    severity: warning
  annotations:
    summary: CouchDB Mango queries failed due to invalid index (instance {{ $labels.instance }})
    description: "Some Mango queries failed to execute because the index was missing or invalid\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"
warning

2.15.20.CouchDB Mango docs examined high

High number of documents examined per Mango queries, consider indexing

  # 1000/s is a rough default; depends on your query patterns and dataset size — adjust based on your workload, or add indexes.
- alert: CouchdbMangoDocsExaminedHigh
  expr: 'rate(couchdb_mango_docs_examined[5m]) > 1000'
  for: 5m
  labels:
    severity: warning
  annotations:
    summary: CouchDB Mango docs examined high (instance {{ $labels.instance }})
    description: "High number of documents examined per Mango queries, consider indexing\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"
warning

2.15.21.CouchDB replication read failures

Replication changes feed has failed reads more than 5 times in 5 minutes

- alert: CouchdbReplicationReadFailures
  expr: 'increase(couchdb_replicator_changes_read_failures[5m]) > 5'
  for: 5m
  labels:
    severity: warning
  annotations:
    summary: CouchDB replication read failures (instance {{ $labels.instance }})
    description: "Replication changes feed has failed reads more than 5 times in 5 minutes\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"
warning

2.15.22.CouchDB 4xx error rate high

CouchDB returned more than 5 4xx HTTP responses in the last 5 minutes, which may indicate client-side issues such as bad requests, authentication failures, or document conflicts.

- alert: Couchdb4xxErrorRateHigh
  expr: 'increase(couchdb_httpd_status_codes{code=~"4.."}[5m]) > 5'
  for: 5m
  labels:
    severity: warning
  annotations:
    summary: CouchDB 4xx error rate high (instance {{ $labels.instance }})
    description: "CouchDB returned more than 5 4xx HTTP responses in the last 5 minutes, which may indicate client-side issues such as bad requests, authentication failures, or document conflicts.\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"
warning

2.15.23.CouchDB Replicator jobs pending

More than 10 replicator jobs are pending, which may mean replication is falling behind.

  # 10 is a rough default; replication backlog scales with your replication workload and network — adjust based on your baseline.
- alert: CouchdbReplicatorJobsPending
  expr: 'couchdb_replicator_jobs{metric="pending"} > 10'
  for: 5m
  labels:
    severity: warning
  annotations:
    summary: CouchDB Replicator jobs pending (instance {{ $labels.instance }})
    description: "More than 10 replicator jobs are pending, which may mean replication is falling behind.\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"
warning

2.15.24.CouchDB request latency high

Average CouchDB request time is above 500ms, indicating degraded performance.

  # 500ms threshold is a rough default; normal request latency depends on your query complexity and dataset size — adjust based on your baseline.
- alert: CouchdbRequestLatencyHigh
  expr: 'couchdb_httpd_request_time{metric="ArithmeticMean"} > 500'
  for: 5m
  labels:
    severity: warning
  annotations:
    summary: CouchDB request latency high (instance {{ $labels.instance }})
    description: "Average CouchDB request time is above 500ms, indicating degraded performance.\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"

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