[2.3.0] Checkmk Werk 16285 created: rules: match_on items must be at least of length 1

Title: rules: match_on items must be at least of length 1 Class: fix Compatible: compat Component: rest-api Date: 1702450037 Edition: cee Level: 1 Version: 2.3.0b1 This werk addresses an issue found by our QA team on the rules collection POST endpoint ...domain-types/rule/collections/all The match_on field requires a list of strings but didn't enforce any length. Previously, passing an empty string would provoke a crash. We now enforce a minimum string length of 1.