Werk #15641: Prometheus: Properly Encode PromQL Queries

Component	Checks & agents
Title	Prometheus: Properly Encode PromQL Queries
Date	Sep 10, 2023
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.3.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.2.0p10 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT

The Prometheus agent allows specifying PromQL queries via the option Service creation using PromQL queries. In 2.2.0, any query containing a '+' would not be encoded properly. For example, the query

up{container=".+"}

would result in a HTTP request, which is interpreted by Prometheus as

up{container=". "}

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