State and health of alerting rules

• Normal: None of the time series returned by the evaluation engine is in a Pending or Firing state.
• Firing: At least one time series returned by the evaluation engine is Firing.

• Normal: Condition for the alerting rule is false for every time series returned by the evaluation engine.
• Alerting: Condition of the alerting rule is true for at least one time series returned by the evaluation engine. The duration for which the condition must be true before an alert fires, if set, is met or has exceeded.
• Pending: Condition of the alerting rule is true for at least one time series returned by the evaluation engine. The duration for which the condition must be true before an alert fires, if set, has not been met.
• Error: Error when attempting to evaluate an alerting rule.

• Ok: No error when evaluating an alerting rule.
• Error: Error when evaluating an alerting rule.
• NoData: The absence of data in at least one time series returned during a rule evaluation.