Micronaut: How to get metrics in the Prometheus format? - metrics

Question

How should I configure the Micronaut to get the /metrics in the Prometheus format ?
Used: micronaut 1.0.0.M3
Now:
micronaut:
...
metrics:
enabled: true
export:
prometheus:
enabled: true
and result: metrics name list
{"names":["jvm.memory.max","executor.pool.size"...]}
I need to get: metrics in the prometheus format(formats)

Answer 1

Micronaut Micrometer has an PrometheusEndpoint from version 1.1 that will
return in Prometheus format from /prometheus and
can be enabled in application.yml by:
endpoints:
prometheus:
sensitive: false
In combination with
micronaut:
metrics:
enabled: true
export:
prometheus:
enabled: true
step: PT1M
descriptions: true
(The documentation is missing the endpoint config but will be changed in the new release)

Answer 2

To piggyback on the other answers, here is an Micronaut endpoint that provides the Prometheus metrics in the format we needed:
package your.package.name
import io.micrometer.prometheus.PrometheusMeterRegistry
import io.micronaut.management.endpoint.annotation.Endpoint
import io.micronaut.management.endpoint.annotation.Read
#Endpoint(id = "prometheus", value = "/prometheus", defaultEnabled = true,
defaultSensitive = false)
class PrometheusController(val prometheusMeterRegistry: PrometheusMeterRegistry) {
#Read
fun scrape(): String {
return prometheusMeterRegistry.scrape()
}
}

Answer 3

At the moment, we solved the problem as follows.
Added a new endpoint. Or create a controller with a mapping on /metrics.
The new endpoint added a return of scrape().
Correlated endpoint with /prometheus (new endpoint can not be mapped on /metrics).
Disconnected endpoint metrics which by default.
Config:
micronaut:
...
metrics:
enabled: true
export:
prometheus:
enabled: true
...
endpoints:
...
metrics:
enabled: false
prometheus:
enabled: true

Answer 4

Haven't tested this out but based on the following:
https://github.com/micronaut-projects/micronaut-core/blob/master/configurations/micrometer-registry-prometheus/src/main/java/io/micronaut/configuration/metrics/micrometer/prometheus/PrometheusMeterRegistryFactory.java
Your yaml should look like
metrics:
prometheus:
enabled: true
don't believe the export comes into play.