.netgrafanagrafana-loki
How to create alert for logged errors?
I have a stream of log messages in Loki, and I want to create an alert if error is logged.
Here is the query I wrote for the alert
sum by (app) (count_over_time({app="my-app"} | json | Level="Error" or Level="Critical" or Level="Fatal"[5m])) > 0
However, when I try to preview, I get the error:
invalid format of evaluation results for the alert definition Failures: looks like time series data, only reduced data can be alerted on.
What should I do to make grafna happy?
Solution
You have to reduce the query first and set the right alert condition. Documentation: https://grafana.com/docs/grafana/latest/alerting/unified-alerting/alerting-rules/create-grafana-managed-rule/):
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