Werk #18006: OTel: Define host name computation per receiver

Component	Checks & agents
Title	OTel: Define host name computation per receiver
Date	May 5, 2025
Level	Trivial Change
Class	New Feature
Compatibility	Incompatible - Manual interaction might be required
Checkmk versions & editions	2.5.0b1 Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT 2.4.0p1 Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT

Instead of one "host name computation" mapping per collector and site these mapping can now be defined per receiver, i.e. per OTLP endpoint and Prometheus scrape config.

This is a breaking change. Users will need to reconfigure and reactivate the collector configuration.

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