Alerting: Fix stale values associated with states that have gone to NoData, unify values calculation (#89807)

* Unify values * Fix with latest changes on main * Fix up NaN test * Keep refIDs with -1 as value * Test that refIDs are preserved on Normal to Error transition * Alerting to err test too * Add a blurb to docs about this behavior
2024-07-08 12:30:23 -05:00
parent f763f2085b
commit 3b6a8775bb
11 changed files with 209 additions and 82 deletions
@@ -269,6 +269,8 @@ You can also configure the alert instance state when its evaluation returns an e
 | Normal              | Sets alert instance state to `Normal`.                                                                                                                                                                                                 |
 | Keep Last State     | Maintains the alert instance in its last state. Useful for mitigating temporary issues, refer to [Keep last state](ref:keep-last-state).                                                                                               |

+When you configure the No data or Error behavior to `Alerting` or `Normal`, Grafana will attempt to keep a stable set of fields under notification `Values`. If your query returns no data or an error, Grafana re-uses the latest known set of fields in `Values`, but will use `-1` in place of the measured value.
+
 ## Create alerts from panels

 Create alerts from any panel type. This means you can reuse the queries in the panel and create alerts based on them.