[7.x] Ensure type exists for all monitoring configuration (#57399) #57704
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elastic#47711 and elastic#47246 helped to validate that monitoring settings are rejected at time of setting the monitoring settings. Else an invalid monitoring setting can find it's way into the cluster state and result in an exception thrown [1] on the cluster state application (there by causing significant issues). Some additional monitoring settings have been identified that can result in invalid cluster state that also result in exceptions thrown on cluster state application. All settings require a type of either http or local to be applicable. When a setting is changed, the exporters are automatically updated with the new settings. However, if the old or new settings lack of a type setting an exception will be thrown (since exporters are always of type 'http' or 'local'). Arguably we shouldn't blindly create and destroy new exporters on each monitoring setting update, but the lifecycle of the exporters is abit out the scope this PR is trying to address. This commit introduces a similar methodology to check for validity as elastic#47711 and elastic#47246 but this time for ALL (including non-http) settings. Monitoring settings are not useful unless there an exporter with a type defined. The type is used as dependent setting, such that it must exist to set the value. This ensures that when any monitoring settings changes that they can only get added to cluster state if the type exists. If the type exists (and the other validations pass) then the exporters will get re-built and the cluster state remains valid. Tests have been included to ensure that all dynamic monitoring settings have the type as dependent settings. [1] org.elasticsearch.common.settings.SettingsException: missing exporter type for [found-user-defined] exporter at org.elasticsearch.xpack.monitoring.exporter.Exporters.initExporters(Exporters.java:126) ~[?:?]
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Backports the following commits to 7.x: