From a comment on the 3.0 announcement blog post:

Also the change to Micrometer properties (like management.metrics.export.(provider).enabled) are not reported by spring-boot-properties-migrator dependency.

Comment From: wilkinsona

I've tested this with 3.0.2 and all of 2.7.x's metrics export properties are reported:

The use of configuration keys that have been renamed was found in the environment:

Property source 'Config resource 'class path resource [application.properties]' via location 'optional:classpath:/'':
    Key: management.metrics.export.appoptics.enabled
        Line: 1
        Replacement: management.appoptics.metrics.export.enabled
    Key: management.metrics.export.atlas.enabled
        Line: 2
        Replacement: management.atlas.metrics.export.enabled
    Key: management.metrics.export.datadog.enabled
        Line: 3
        Replacement: management.datadog.metrics.export.enabled
    Key: management.metrics.export.dynatrace.enabled
        Line: 4
        Replacement: management.dynatrace.metrics.export.enabled
    Key: management.metrics.export.elastic.enabled
        Line: 5
        Replacement: management.elastic.metrics.export.enabled
    Key: management.metrics.export.ganglia.enabled
        Line: 6
        Replacement: management.ganglia.metrics.export.enabled
    Key: management.metrics.export.graphite.enabled
        Line: 7
        Replacement: management.graphite.metrics.export.enabled
    Key: management.metrics.export.humio.enabled
        Line: 8
        Replacement: management.humio.metrics.export.enabled
    Key: management.metrics.export.influx.enabled
        Line: 9
        Replacement: management.influx.metrics.export.enabled
    Key: management.metrics.export.jmx.enabled
        Line: 10
        Replacement: management.jmx.metrics.export.enabled
    Key: management.metrics.export.kairos.enabled
        Line: 11
        Replacement: management.kairos.metrics.export.enabled
    Key: management.metrics.export.newrelic.enabled
        Line: 12
        Replacement: management.newrelic.metrics.export.enabled
    Key: management.metrics.export.prometheus.enabled
        Line: 13
        Replacement: management.prometheus.metrics.export.enabled
    Key: management.metrics.export.signalfx.enabled
        Line: 14
        Replacement: management.signalfx.metrics.export.enabled
    Key: management.metrics.export.simple.enabled
        Line: 15
        Replacement: management.simple.metrics.export.enabled
    Key: management.metrics.export.stackdriver.enabled
        Line: 16
        Replacement: management.stackdriver.metrics.export.enabled
    Key: management.metrics.export.statsd.enabled
        Line: 17
        Replacement: management.statsd.metrics.export.enabled
    Key: management.metrics.export.wavefront.enabled
        Line: 18
        Replacement: management.wavefront.metrics.export.enabled


Each configuration key has been temporarily mapped to its replacement for your convenience. To silence this warning, please update your configuration to use the new keys.