May 2019
Intermediate to advanced
442 pages
11h 36m
English
Content preview from Hands-On Infrastructure Monitoring with Prometheus
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Labels and annotations
In the alert rule definition, there were two optional sections: labels and annotations. Labels define the identity of an alert and they can change according to the evaluation cycle they're in; if they do this, it will alter the alert identity. To demonstrate this point, we'll introduce the ALERTS metric, which tracks all active alerts and their labels. As we can see in the following figure, we have a label called alertstate, which tracks the alert state and transitions from pending to firing:
Figure 9.6: The ALERTS metric
Something to keep in mind is the issue of using a sample value in a label. Although it is technically ...
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