Spring Boot 2.0.0.M6: Show all metrics with one request

Question

With Spring Boot 2.0.0.M6 and the new actuator metrics endpoint, when I request

GET /application/metrics

the only the names of the metrics are shown

{
  "names" : [ "data.source.active.connections", "jvm.buffer.memory.used", "jvm.memory.used", "jvm.buffer.count", "logback.events", "process.uptime", "jvm.memory.committed", "data.source.max.connections", "http.server.requests", "system.load.average.1m", "jvm.buffer.total.capacity", "jvm.memory.max", "process.start.time", "cpu", "data.source.min.connections" ]
}

Clearly I can access a specific metric using GET /application/metrics/jvm.memory.used

But is there a way to see all metrics with one request?

Answer 1

That's how the metrics endpoint behaves in the Spring Boot 2.0.0M* releases. There are only two read operations defined in the endpoint class:

• ListNamesResponse listNames()
  • Resolves to GET /application/metrics
• MetricResponse metric(@Selector String requiredMetricName, @Nullable List<String> tag)
  • Resolves to GET /application/metrics/jvm.memory.used

Metrics support has changed quite dramatically in 2.x (now backed by Micrometer) and the Spring Boot 2.x upgrade guide is lacking any details on metrics at the moment but it's a work in progress, so presumably more details will arive as Spring Boot 2.0 gets closer to a GA release.

I suspect the move from hierarchical metrics to dimensional metrics resulted in the maintainers deeming the 1.x (hierarchical) metrics display to be no longer viable/suitable.