RedisDown

RedisDown #

Redis instance is down

Alert Rule
alert: RedisDown
annotations:
  description: |-
    Redis instance is down
      VALUE = {{ $value }}
      LABELS = {{ $labels }}    
  runbook: https://srerun.github.io/prometheus-alerts/runbooks/oliver006-redis-exporter/redisdown/
  summary: Redis down (instance {{ $labels.instance }})
expr: redis_up == 0
for: 0m
labels:
  severity: critical

Here is a runbook for the RedisDown alert rule:

Meaning #

The RedisDown alert is triggered when the redis_up metric returns a value of 0, indicating that the Redis instance is not responding or is down. This alert is critical, as Redis is a key component of our application and its unavailability can significantly impact our users.

Impact #

The impact of this alert is high, as Redis is a critical component of our application. If Redis is down, our application may not be able to function properly, leading to:

  • Loss of data
  • Decreased performance
  • Errors and exceptions
  • Unavailability of key features
  • Potential revenue loss

Diagnosis #

To diagnose the issue, follow these steps:

  1. Check the Redis instance’s logs for errors or exceptions.
  2. Verify that the Redis process is running and that there are no issues with the underlying infrastructure (e.g. disk space, memory, etc.).
  3. Check the network connectivity between the Prometheus server and the Redis instance.
  4. Verify that the Redis exporter is properly configured and sending metrics to Prometheus.
  5. Check the Redis configuration file for any changes or errors.

Mitigation #

To mitigate the issue, follow these steps:

  1. Restart the Redis instance if it is not running.
  2. Investigate and resolve any underlying infrastructure issues (e.g. disk space, memory, etc.).
  3. Check and update the Redis configuration file if necessary.
  4. Verify that the Redis exporter is properly configured and sending metrics to Prometheus.
  5. Consider implementing redundancy or failover mechanisms for the Redis instance to prevent future downtime.

Additional resources:

Note: This runbook is a general guide and may need to be customized to fit your specific use case and environment.

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