Werk #14561: Prometheus: allow operation of special agent without querying targets endpoint

Component Checks & agents
Title Prometheus: allow operation of special agent without querying targets endpoint
Date Oct 3, 2022
Checkmk Editon Checkmk Raw (CRE)
Checkmk Version 2.2.0i1 2.1.0p15 2.0.0p30
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed

Previously, the Prometheus special agent would query the endpoint `/api/v1/targets` regardless of what was configured in the Prometheus rule. This was an additional burden on users, which did not specify any scrape targets and therefore do not need this endpoint. E.g., it can lead to additional timeouts. With this werk, the endpoint `/api/v1/targets` is only queried if necessary.

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