Checkmk Werk 10130: Fixed performance bug in monitoring history cache

ID: 10130 Title: Fixed performance bug in monitoring history cache Component: Core & setup Level: 2 Class: Bug fix Version: 2.1.0i1 During startup, the CMC caches information from the monitoring history up to a given horizon in the past. This caching had a performance bug (quadratic complexity), resulting in caching times of several days or even more, depending on the content of the monitoring history. This has been fixed, caching time is now linear in the size of the monitoring history.