Problem
mp_app, used at app level, causes one of (server's) /metrics and (app's) servlet stats to not register
For example, an HTTP endpoint could apply to both an app's endpoints and to server-level endpoints such as /metrics or /health. If the app uses the mp_app tag on its metrics then, because we require all tag sets to be consistent for a metric name, the server-level metrics must similarly have an mp_app tag. Since the mp_app value is not generally set at a server level, it is not possible to use it for server-level endpoints.
Potential solution:
provide config setting so users can set a default mp_app to use for all server metrics that overlap with metric names apps will use (eg. REST metrics)
would want this to be part of the spec (5.0.1), because this problem is due to spec requirement that tag sets for a given metric name be consistent (which was necessary due to prometheus client requirement for same)
currently we have mp.metrics.appName
propose we add mp.metrics.defaultAppName
In cases where a metric name is likely to be used by both applications and the runtime/app server, the value of mp.metrics.defaultAppName will be automatically added to those runtime/app server metrics and will be automatically used for any app that doesn’t specify mp.metrics.appName.
Problem mp_app, used at app level, causes one of (server's) /metrics and (app's) servlet stats to not register
For example, an HTTP endpoint could apply to both an app's endpoints and to server-level endpoints such as
/metricsor/health. If the app uses the mp_app tag on its metrics then, because we require all tag sets to be consistent for a metric name, the server-level metrics must similarly have an mp_app tag. Since the mp_app value is not generally set at a server level, it is not possible to use it for server-level endpoints.Potential solution:
mp.metrics.appNamemp.metrics.defaultAppNamemp.metrics.defaultAppNamewill be automatically added to those runtime/app server metrics and will be automatically used for any app that doesn’t specifymp.metrics.appName.