Link observability section to Micrometer Observation Handler docs
This commit links the Spring Framework Observability section in the
reference documentation to the Micrometer docs describing how
Observations are handled as metrics.
Closes gh-34994
With https://docs.micrometer.io/micrometer/reference/concepts.html[Micrometer], developers can instrument libraries and applications for metrics (timers, gauges, counters)
that collect statistics about their runtime behavior. Metrics can help you to track error rates, usage patterns, performance, and more.
https://docs.micrometer.io/tracing/reference/[Micrometer can also produce traces], giving you a holistic view of an entire system, crossing application boundaries; you can zoom in on particular user requests and follow their entire completion across applications.
Micrometer defines an {micrometer-docs}/observation.html[Observation concept that enables both Metrics and Traces] in applications.
Metrics support offers a way to create timers, gauges, or counters for collecting statistics about the runtime behavior of your application.
Metrics can help you to track error rates, usage patterns, performance, and more.
Traces provide a holistic view of an entire system, crossing application boundaries; you can zoom in on particular user requests and follow their entire completion across applications.
Each observation will produce:
* https://docs.micrometer.io/micrometer/reference/observation/components.html#micrometer-observation-default-meter-handler[several metrics - a timer, a long task timer and many counters]
* a https://docs.micrometer.io/tracing/reference/glossary.html[span for the current trace]
Spring Framework instruments various parts of its own codebase to publish observations if an `ObservationRegistry` is configured.
You can learn more about {spring-boot-docs-ref}/actuator/observability.html[configuring the observability infrastructure in Spring Boot].
Brian Clozel
1 day ago