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Werk #18025: agent_alertmanager: fix wrong enpoint url

Component Checks & agents
Title agent_alertmanager: fix wrong enpoint url
Date May 12, 2025
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed
Checkmk versions & editions
2.5.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT
2.4.0p1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT

The special agent was crashing with the following error:

  File "/omd/sites/site_name/lib/python3.12/json/decoder.py", line 356, in raw_decode
    raise JSONDecodeError("Expecting value", s, err.value) from None
json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)

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