Alert thresholds depend on the nature of your applications. Some queries may have arbitrary tolerance thresholds. Building an efficient monitoring platform takes time. 😉
3 Prometheus alerting rules for Apache. Exported via Lusitaniae/apache_exporter. These rules cover critical and warning conditions — copy and paste the YAML into your Prometheus configuration.
groups:
- name: LusitaniaeApacheExporter
rules:
- alert: ApacheDown
expr: apache_up == 0
for: 0m
labels:
severity: critical
annotations:
summary: Apache down (instance {{ $labels.instance }})
description: "Apache down\n VALUE = {{ $value }}\n LABELS = {{ $labels }}"
- alert: ApacheWorkersLoad
expr: (sum by (instance) (apache_workers{state="busy"}) / sum by (instance) (apache_scoreboard) ) * 100 > 80 and sum by (instance) (apache_scoreboard) > 0
for: 2m
labels:
severity: warning
annotations:
summary: Apache workers load (instance {{ $labels.instance }})
description: "Apache workers in busy state approach the max workers count 80% workers busy on {{ $labels.instance }}\n VALUE = {{ $value }}\n LABELS = {{ $labels }}"
- alert: ApacheRestart
expr: apache_uptime_seconds_total / 60 < 1
for: 0m
labels:
severity: info
annotations:
summary: Apache restart (instance {{ $labels.instance }})
description: "Apache has just been restarted.\n VALUE = {{ $value }}\n LABELS = {{ $labels }}" wget https://raw.githubusercontent.com/samber/awesome-prometheus-alerts/refs/heads/master/dist/rules/apache/lusitaniae-apache-exporter.yml
Apache down
- alert: ApacheDown
expr: apache_up == 0
for: 0m
labels:
severity: critical
annotations:
summary: Apache down (instance {{ $labels.instance }})
description: "Apache down\n VALUE = {{ $value }}\n LABELS = {{ $labels }}" Apache workers in busy state approach the max workers count 80% workers busy on {{ $labels.instance }}
- alert: ApacheWorkersLoad
expr: (sum by (instance) (apache_workers{state="busy"}) / sum by (instance) (apache_scoreboard) ) * 100 > 80 and sum by (instance) (apache_scoreboard) > 0
for: 2m
labels:
severity: warning
annotations:
summary: Apache workers load (instance {{ $labels.instance }})
description: "Apache workers in busy state approach the max workers count 80% workers busy on {{ $labels.instance }}\n VALUE = {{ $value }}\n LABELS = {{ $labels }}" Apache has just been restarted.
- alert: ApacheRestart
expr: apache_uptime_seconds_total / 60 < 1
for: 0m
labels:
severity: info
annotations:
summary: Apache restart (instance {{ $labels.instance }})
description: "Apache has just been restarted.\n VALUE = {{ $value }}\n LABELS = {{ $labels }}"