Custom Tag Provider

[dtaveras]

The generation of tags is tied to Label types. Is there a way to add a custom tag?
I do understand that there is common tags in the MeterRegistry but i was more looking for one when creating the Meter. As an example I want to tag each meter with a user

[jotak]

Hi @dtaveras ,

As you say, the MeterRegistry has common tags ; and you can get that registry to impact all registered metrics. E.g.

    MeterRegistry registry = BackendRegistries.getDefaultNow();
    registry.config().commonTags("user", "alice");

Is that not what you're looking for?

[dtaveras]

I was more interested in being able to extract more information based on the request, so having a tag provider with signature Request -> [Tag].
As example we also use https://github.com/micrometer-metrics/micrometer/blob/master/micrometer-jersey2/src/main/java/io/micrometer/jersey2/server/MetricsRequestEventListener.java which accepts a tag provider with the signature above.

public interface JerseyTagsProvider {

/**
 * Provides tags to be associated with metrics for the given {@code event}.
 *
 * @param event
 *            the request event
 * @return tags to associate with metrics recorded for the request
 */
Iterable<Tag> httpRequestTags(RequestEvent event);

/**
 * Provides tags to be associated with the
 * {@link io.micrometer.core.instrument.LongTaskTimer} which instruments the
 * given long-running {@code event}.
 *
 * @param event
 *            the request event
 * @return tags to associate with metrics recorded for the request
 */
Iterable<Tag> httpLongRequestTags(RequestEvent event);

}

[dtaveras]

common tags will do for now, was just curious if i missed something.

[jotak]

I think I get it, it seems like a good enhancement to add.

[dtaveras]

Thanks, great job with this library. A ton of great features and easy to configure.

[vietj]

@jotak do we have a contributor for this enhancement ?

[jotak]

@vietj not that I know. I'm going to take a look.