Checkmk Werk 13288: Improve speed of activate changes by incremental activating changes

ID: 13288 Title: Improve speed of activate changes by incremental activating changes Component: Setup Level: 2 Class: New feature Version: 2.1.0i1 With this change the microcore and its helper processes are able to reuse parts of the previous configuration, without compiling everything anew. Only actually changed hosts will be fully recompiled. This can significantly reduce the waiting time for "Activate changes". In addition, the workload during the compilation phase is also reduced, giving the monitoring core some room to breathe. F+: ## Compilation time comparison using a demo config with 150k services ## # Full compiliation of all hosts (default behaviour in all previous versions) real 0m21.107s user 2m10.626s sys 0m2.581s # Using new incremental activation real 0m6.936s user 0m24.366s sys 0m1.492s F-: The incremental activation mechanism is used automatically when it is feasible. Actions where hosts are changed (edit/add/remove/discovery) can make use of this new feature. However, changes to rulesets require a complete recompilation of the entire configuration, just as in previous versions.