Advanced Mode TriggerΒΆ
Sometimes a simple trigger (Simple Threshold Trigger) doesn’t provide enough flexibility for your task.
For example, you may want to receive a notification when 5% of user requests take up more than a second to process, but only if there are more than 100 requests per minute. Usually, you will have two separate metrics for this:
Nginx.requests.process_time.p95
- 95th percentile of request processing time in millisecondsNginx.requests.count
- request count per minute
Maybe you can construct a monstrous Graphite expression to reflect this combination, but Moira’s Advanced Mode is better:
You can use any govaluate expression with predefined constants here:
t1
,t2
, ... are values from your targetsOK
,WARN
,ERROR
,NODATA
are states that must be the result of evaluationPREV_STATE
is equal to previously set state, and allows you to prevent frequent state changes
Note
Only T1 target can resolve into multiple metrics in Advanced Mode. T2, T3, ... must resolve to single metrics. Moira will calculate expression separately for every metric in T1.
Any incorrect expressions or bad syntax will result in EXCEPTION trigger state.