Tools / Apache HertzBeat Interview Questions
What is a threshold rule in HertzBeat?
A threshold rule is the policy object that decides whether collected metric data should trigger an alarm. You pick a metric object (for example, a website monitor's response-time field), write a trigger expression, and set the alarm level, notification template, and which monitors the rule applies to.
Threshold rules come in two flavors: real-time, evaluated the instant new data is collected, and scheduled, evaluated periodically using PromQL- or SQL-style expressions over a time window. Both support graphical configuration or writing the raw expression directly.
A threshold rule is fundamentally a policy that:
The two evaluation modes for a threshold rule are:
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