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Sleep Peacefully

Alerting time window

In some applications, load and activity can vary over the day/week/year.

In order to prevent alarm fatigue and busy pager, alerts can be disabled during a period of time (such as night or weekend).

Example:

  • Weekday: node_load5 > 10 and ON() (0 < day_of_week() < 6)
  • Day time: node_load5 > 10 and ON() (8 < hour() < 18)
  • Exclude December: node_load5 > 10 and ON() (month() != 12)

Advanced time windows and timezones

# rules.yml

groups:
  - name: timezones
    rules:
    - record: european_summer_time_offset
      expr: |
          (vector(1) and (month() > 3 and month() < 10))
          or
          (vector(1) and (month() == 3 and (day_of_month() - day_of_week()) >= 25) and absent((day_of_month() >= 25) and (day_of_week() == 0)))
          or
          (vector(1) and (month() == 10 and (day_of_month() - day_of_week()) < 25) and absent((day_of_month() >= 25) and (day_of_week() == 0)))
          or
          (vector(1) and ((month() == 10 and hour() < 1) or (month() == 3 and hour() > 0)) and ((day_of_month() >= 25) and (day_of_week() == 0)))
          or
          vector(0)

    - record: europe_london_time
      expr: time() + 3600 * european_summer_time_offset
    - record: europe_paris_time
      expr: time() + 3600 * (1 + european_summer_time_offset)

    - record: europe_london_hour
      expr: hour(europe_london_time)
    - record: europe_paris_hour
      expr: hour(europe_paris_time)

    - record: europe_london_weekday
      expr: 0 < day_of_week(europe_london_time) < 6
    - record: europe_paris_weekday
      expr: 0 < day_of_week(europe_paris_time) < 6
    # opposite
    - record: not_europe_london_weekday
      expr: absent(europe_london_weekday)
    - record: not_europe_paris_weekday
      expr: absent(europe_paris_weekday)

    - record: europe_london_business_hours
      expr: 9 < europe_london_hour < 18
    - record: europe_paris_business_hours
      expr: 9 < europe_paris_hour < 18
    # opposite
    - record: not_europe_london_business_hours
      expr: absent(europe_london_business_hours)
    - record: not_europe_paris_business_hours
      expr: absent(europe_paris_business_hours)

    # new year's day / xmas / labor day / all saints' day / ...
    - record: europe_french_public_holidays
      expr: |
          (vector(1) and month(europe_paris_time) == 1 and day_of_month(europe_paris_time) == 1)
          or
          (vector(1) and month(europe_paris_time) == 12 and day_of_month(europe_paris_time) == 25)
          or
          (vector(1) and month(europe_paris_time) == 5 and day_of_month(europe_paris_time) == 1)
          or
          (vector(1) and month(europe_paris_time) == 11 and day_of_month(europe_paris_time) == 1)
          or
          vector(0)
    # opposite
    - record: not_europe_french_public_holidays
      expr: absent(europe_french_public_holidays)
# alerts.yml

groups:
  - name: CPU Load
    rules:
      - alert: HighLoadQuietDuringWeekendAndNight
        expr: node_load5 > 10 and ON() (europe_london_weekday and europe_paris_weekday)

      - alert: HighLoadQuietDuringBackup
        expr: node_load5 > 10 and ON() absent(hour() == 2)

      - alert: HighLoad
        expr: |
            node_load5 > 20 and ON() (europe_london_weekday and europe_paris_weekday)
            or
            node_load5 > 10

Sources