fix: label mismatch for alertmanager_notifications_failed_total #3599
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| @@ -44,7 +44,7 @@ | |||
| ( | |||
| rate(alertmanager_notifications_failed_total{%(alertmanagerSelector)s}[5m]) | |||
| / | |||
| rate(alertmanager_notifications_total{%(alertmanagerSelector)s}[5m]) | |||
| on (integration) group_left rate(alertmanager_notifications_total{%(alertmanagerSelector)s}[5m]) | |||
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I'd suggest to ignore the reason label since it's the only one that's different between the 2 metrics. It will change a bit the alert condition in case of multiple reasons (e.g. the sum for all reasons might be above the threshold while the individual reasons are below). But the current threshold value is low enough that it shouldn't be an issue in practice.
Suggested change
| on (integration) group_left rate(alertmanager_notifications_total{%(alertmanagerSelector)s}[5m]) | |
| ignoring (reason) group_left rate(alertmanager_notifications_total{%(alertmanagerSelector)s}[5m]) |
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Thanks for your suggestion. Fixed.
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Signed-off-by: chengzw <chengzw258@163.com>
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Since Alertmanager 0.26.0 version, a new label
reasonwas added in thealertmanager_notifications_failed_totalmetric to indicate the type of error of the alert delivery.As a result, the original alert rules are broken because labels are mismatched between
alertmanager_notifications_failed_totalandalertmanager_notifications_total metrics.Prometheus requires samples with exactly the same labels to get matched together when performing calculations. docs
Use the
ignoringvector matching keyword to ignore the newreasonlabel to allow for matching between series with different labels.