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Cassandra¶

This section lists the alerts for Cassandra.

CassandraAuthFailures
CassandraCacheHitRateTooLow
CassandraClientRequestFailure
CassandraClientRequestUnavailable
CassandraClusterTargetDown
CassandraClusterTargetsOutage
CassandraCommitlogTasksPending
CassandraCompactionExecutorTasksBlocked
CassandraCompactionTasksPending

CassandraConnectionTimeouts
CassandraFlushWriterTasksBlocked
CassandraHintsTooMany
CassandraRepairTasksBlocked
CassandraStorageExceptions
CassandraTombstonesTooManyCritical
CassandraTombstonesTooManyMajor
CassandraTombstonesTooManyWarning
CassandraViewWriteLatencyTooHigh

CassandraAuthFailures¶

Severity	Warning
Summary	Cassandra authentication failures.
Description	The `{{ $labels.namespace }}`/`{{ $labels.pod }}` Cassandra Pod in the `{{ $labels.cassandra_cluster }}` cluster reports an increased number of authentication failures.

CassandraCacheHitRateTooLow¶

Severity	Major
Summary	Cassandra cache hit rate is too low.
Description	The average hit rate for the `{{ $labels.cache }}` cache in the `{{ $labels.namespace }}`/`{{ $labels.pod }}` Cassandra Pod in the `{{ $labels.cassandra_cluster }}` cluster is below 85%.

CassandraClientRequestFailure¶

Severity	Major
Summary	Cassandra client `{{ $labels.operation }}` request failure.
Description	The `{{ $labels.namespace }}`/`{{ $labels.pod }}` Cassandra Pod in the `{{ $labels.cassandra_cluster }}` cluster reports an increased number of `{{ $labels.operation }}` operation failures. A failure is a non-timeout exception.

CassandraClientRequestUnavailable¶

Severity	Critical
Summary	Cassandra client `{{ $labels.operation }}` request is unavailable.
Description	The `{{ $labels.namespace }}`/`{{ $labels.pod }}` Cassandra Pod in the `{{ labels.cassandra_cluster }}` cluster reports an increased number of `{{ $labels.operation }}` operations ending with `UnavailableException`. There are not enough replicas alive to perform the `{{ $labels.operation }}` query with the requested consistency level.

CassandraClusterTargetDown¶

Available since 23.3 to replace CassandraClusterTargetsOutage

Severity	Critical
Summary	Cassandra cluster target down.
Description	Prometheus fails to scrape metrics from the `{{ $labels.pod }}` Pod of the {{ $labels.cluster }} cluster on the {{ $labels.node }} node.

CassandraClusterTargetsOutage¶

Replaced by CassandraClusterTargetDown in 23.3

Severity	Critical
Summary	Cassandra cluster Prometheus targets outage.
Description	Prometheus fails to scrape metrics from 2/3 of the `{{ $labels.cluster }}` cluster endpoints (more than 1/10 failed scrapes).

CassandraCommitlogTasksPending¶

Severity	Warning
Summary	Cassandra `commitlog` has too many pending tasks.
Description	The `commitlog` in the `{{ $labels.namespace }}`/ `{{ $labels.pod }}` Cassandra Pod in the `{{ $labels.cassandra_cluster }}` cluster reached 15 pending tasks.

CassandraCompactionExecutorTasksBlocked¶

Severity	Warning
Summary	Cassandra compaction executor tasks are blocked.
Description	The `{{ $labels.namespace }}`/`{{ $labels.pod }}` Cassandra Pod in the `{{ labels.cassandra_cluster }}` cluster reports that `{{ $value }}` compaction executor tasks are blocked.

CassandraCompactionTasksPending¶

Severity	Warning
Summary	Cassandra has too many pending compactions.
Description	The pending compaction tasks in the `{{ $labels.namespace }}`/`{{ $labels.pod }}` Cassandra Pod in the `{{ labels.cassandra_cluster }}` cluster reached the threshold of 100 on average as measured over 30 minutes. This may occur due to a too low cluster I/O capacity.

CassandraConnectionTimeouts¶

Severity	Critical
Summary	Cassandra connection timeouts.
Description	The `{{ $labels.namespace }}`/`{{ $labels.pod }}` Cassandra Pod in the `{{ $labels.cassandra_cluster }}` cluster reports an increased number of connection timeouts between nodes.

CassandraFlushWriterTasksBlocked¶

Severity	Warning
Summary	Cassandra flush writer tasks are blocked.
Description	The `{{ $labels.namespace }}`/`{{ $labels.pod }}` Cassandra Pod in the `{{ $labels.cassandra_cluster }}` cluster reports that `{{ $value }` flush writer tasks are blocked.

CassandraHintsTooMany¶

Severity	Major
Summary	Cassandra has too many hints.
Description	The `{{ $labels.namespace }}`/`{{ $labels.pod }}` Cassandra Pod in the `{{ $labels.cassandra_cluster }}` cluster reports an increased number of hints. Replica nodes are not available to accept mutation due to a failure or maintenance.

CassandraRepairTasksBlocked¶

Severity	Warning
Summary	Cassandra repair tasks are blocked.
Description	The `{{ $labels.namespace }}`/`{{ $labels.pod }}` Cassandra Pod in the `{{ $labels.cassandra_cluster }}` cluster reports that `{{ $value }}` repair tasks are blocked.

CassandraStorageExceptions¶

Severity	Critical
Summary	Cassandra storage exceptions.
Description	The `{{ $labels.namespace }}`/`{{ $labels.pod }}` Cassandra Pod in the `{{ $labels.cassandra_cluster }}` cluster reports an increased number of storage exceptions.

CassandraTombstonesTooManyCritical¶

Severity	Critical
Summary	Cassandra scanned 50000 tombstones.
Description	The `{{ $labels.namespace }}`/`{{ $labels.pod }}` Cassandra Pod in the `{{ $labels.cassandra_cluster }}` cluster scanned `{{ $value }}` tombstones in 99% of read queries.

CassandraTombstonesTooManyMajor¶

Severity	Major
Summary	Cassandra scanned 25000 tombstones.
Description	The `{{ $labels.namespace }}`/`{{ $labels.pod }}` Cassandra Pod in the `{{ $labels.cassandra_cluster }}` cluster scanned `{{ $value }}` tombstones in 99% of read queries.

CassandraTombstonesTooManyWarning¶

Severity	Warning
Summary	Cassandra scanned 10000 tombstones.
Description	The `{{ $labels.namespace }}`/`{{ $labels.pod }}` Cassandra Pod in the `{{ $labels.cassandra_cluster }}` cluster scanned `{{ $value }}` tombstones in 99% of read queries.

CassandraViewWriteLatencyTooHigh¶

Severity	Warning
Summary	Cassandra high view/write latency.
Description	The `{{ $labels.namespace }}`/`{{ $labels.pod }}` Cassandra Pod in the `{{ $labels.cassandra_cluster }}` cluster reports over 1-second view/write latency for 99% of requests.