Cassandra

Cassandra

This section describes the alerts for the Cassandra service.


CassandraServiceDown

Severity

Minor

Summary

The Cassandra service on the {{ $labels.host }} node is down.

Raise condition

procstat_running{process_name="cassandra-server"} == 0

Description

Raises when Telegraf cannot find running cassandra-server processes on the ntw or nal hosts. The host label in the raised alert contains the host name of the affected node.

Troubleshooting

Inspect the Cassandra logs in the /var/log/cassandra/ directory on the affected node.

Tuning

Not required

CassandraServiceDownMinor

Severity

Minor

Summary

More than 30% of Cassandra services are down.

Raise condition

count(procstat_running{process_name="cassandra-server"} == 0) >= count(procstat_running{process_name="cassandra-server"}) *{{ monitoring.services_failed_warning_threshold_percent }}

Description

Raises when Telegraf cannot find running cassandra-server processes on more than 30% of ntw and nal hosts.

Troubleshooting

  • Inspect the CassandraServiceDown alert for the host names of the affected nodes.

  • Inspect the Cassandra logs in /var/log/cassandra/.

Tuning

Not required

CassandraServiceDownMajor

Severity

Major

Summary

More than 60% of Cassandra services are down.

Raise condition

count(procstat_running{process_name="cassandra-server"} == 0) >= count(procstat_running{process_name="cassandra-server"}) *{{ monitoring.services_failed_critical_threshold_percent }}

Description

Raises when Telegraf cannot find running cassandra-server processes on more than 60% of ntw and nal hosts.

Troubleshooting

  • Inspect the CassandraServiceDown alert for the host names of the affected nodes.

  • Inspect the Cassandra logs in /var/log/cassandra/.

Tuning

Not required

CassandraServiceOutage

Severity

Critical

Summary

All Cassandra services are down.

Raise condition

count(procstat_running{process_name="cassandra-server"} == 0) == count(procstat_running{process_name="cassandra-server"})

Description

Raises when Telegraf cannot find running cassandra-server processes on all ntw and nal hosts.

Troubleshooting

  • Inspect the CassandraServiceDown alert for the host names of the affected nodes.

  • Inspect the Cassandra logs in /var/log/cassandra/.

Tuning

Not required