BlackboxSlowProbe

BlackboxSlowProbe #

Blackbox probe took more than 1s to complete

Alert Rule
alert: BlackboxSlowProbe
annotations:
  description: |-
    Blackbox probe took more than 1s to complete
      VALUE = {{ $value }}
      LABELS = {{ $labels }}    
  runbook: https://srerun.github.io/prometheus-alerts/runbooks/blackbox-exporter/blackboxslowprobe/
  summary: Blackbox slow probe (instance {{ $labels.instance }})
expr: avg_over_time(probe_duration_seconds[1m]) > 1
for: 1m
labels:
  severity: warning

Meaning #

The BlackboxSlowProbe alert is triggered when the average duration of a blackbox probe exceeds 1 second over a 1-minute period. This indicates that the blackbox exporter is experiencing slow probe times, which can impact the accuracy and reliability of monitoring data.

Impact #

The impact of this alert can be significant, as it may lead to:

  • Delayed or incomplete monitoring data, potentially causing missed issues or errors
  • Increased latency in alerting and notification systems
  • Reduced confidence in monitoring data, making it harder to troubleshoot issues

Diagnosis #

To diagnose the root cause of the BlackboxSlowProbe alert, follow these steps:

  1. Check the blackbox exporter logs for any errors or warnings related to probe execution
  2. Verify that the blackbox exporter is properly configured and has sufficient resources (e.g., CPU, memory)
  3. Investigate network connectivity issues between the blackbox exporter and the targets being probed
  4. Review the probe configuration to ensure it is optimized for performance
  5. Check for any recent changes to the environment or target systems that may be contributing to the slow probe times

Mitigation #

To mitigate the BlackboxSlowProbe alert, follow these steps:

  1. Optimize the probe configuration to reduce execution time (e.g., adjust timeout values, reduce concurrency)
  2. Scale up or optimize the blackbox exporter resources (e.g., increase CPU or memory allocation)
  3. Implement caching or other performance optimization techniques to reduce the load on the blackbox exporter
  4. Consider splitting the probe workload across multiple blackbox exporters to distribute the load
  5. Monitor the alert and probe performance closely to ensure the mitigation steps are effective and make adjustments as needed
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