PrometheusConfigurationReloadFailure #

Prometheus configuration reload error

alert: PrometheusConfigurationReloadFailure
annotations:
  description: |-
    Prometheus configuration reload error
      VALUE = {{ $value }}
      LABELS = {{ $labels }}    
  runbook: https://srerun.github.io/prometheus-alerts/runbooks/prometheus-self-monitoring-internal/prometheusconfigurationreloadfailure/
  summary: Prometheus configuration reload failure (instance {{ $labels.instance }})
expr: prometheus_config_last_reload_successful != 1
for: 0m
labels:
  severity: warning

Meaning #

The PrometheusConfigurationReloadFailure alert is triggered when the Prometheus configuration reload is unsuccessful. This indicates that Prometheus is unable to load its configuration correctly, which can lead to issues with monitoring, alerting, and data visualization.

Impact #

• Monitoring and alerting capabilities may be compromised, leading to potential downtime or service disruptions.
• Incorrect or outdated configuration can cause Prometheus to misbehave, resulting in inaccurate data or metrics.
• Without a functioning configuration, Prometheus may not be able to send alerts, which can delay incident response and resolution.

Diagnosis #

1. Check the Prometheus configuration file for errors or syntax issues.
2. Verify that the configuration file is correctly formatted and valid.
3. Review the Prometheus logs for error messages related to configuration reload.
4. Check the prometheus_config_last_reload_successful metric to determine the frequency and duration of the reload failures.
5. Investigate recent changes to the configuration file or Prometheus deployment.

Mitigation #

1. Review and correct any errors in the Prometheus configuration file.
2. Restart the Prometheus service to attempt a reload of the configuration.
3. Check the Prometheus logs to ensure the configuration reload is successful.
4. Verify that the prometheus_config_last_reload_successful metric is set to 1, indicating a successful reload.
5. Implement proper configuration management and version control to prevent future issues.
6. Consider implementing automated testing and validation of the Prometheus configuration to catch errors before they occur.

Remember to refer to the provided runbook link for more detailed steps and troubleshooting guidance.