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Document how to enable HTTP client Observation instrumentation 

This commit documents how Observation instrumentation should be
activated for `RestTemplate` and `WebClient`: they both need an
`ObservationRegistry` configured to create and record actual
observations.
This is being done automatically in Spring Boot if auto-configured
builders (`RestTemplateBuilder`, `WebClient.Builder`) are used.

Closes gh-29904
This commit is contained in:
Brian Clozel 2023-02-02 15:41:48 +01:00
parent bc583ea74f
commit 7440afe571
3 changed files with 11 additions and 0 deletions
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6
framework-docs/src/docs/asciidoc/integration/observability.adoc
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@ -125,6 +125,9 @@ Unlike their server counterparts, the instrumentation is implemented directly in
[[integration.observability.http-client.resttemplate]]
=== RestTemplate
Applications must configure an `ObservationRegistry` on `RestTemplate` instances to enable the instrumentation; without that, observations are "no-ops".
Spring Boot will auto-configure `RestTemplateBuilder` beans with the observation registry already set.
Instrumentation is using the `org.springframework.http.client.observation.ClientRequestObservationConvention` by default, backed by the `ClientRequestObservationContext`.
.Low cardinality Keys
@ -151,6 +154,9 @@ Instrumentation is using the `org.springframework.http.client.observation.Client
[[integration.observability.http-client.webclient]]
=== WebClient
Applications must configure an `ObservationRegistry` on the `WebClient` builder to enable the instrumentation; without that, observations are "no-ops".
Spring Boot will auto-configure `WebClient.Builder` beans with the observation registry already set.
Instrumentation is using the `org.springframework.web.reactive.function.client.ClientRequestObservationConvention` by default, backed by the `ClientRequestObservationContext`.
.Low cardinality Keys

3
framework-docs/src/docs/asciidoc/integration/rest-clients.adoc
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@ -117,6 +117,9 @@ TIP: Note that the `java.net` implementation for HTTP requests can raise an exce
accessing the status of a response that represents an error (such as 401). If this is an
issue, switch to another HTTP client library.
NOTE: `RestTemplate` can be instrumented for observability, in order to produce metrics and traces.
See the <<integration.adoc#integration.observability.http-client.resttemplate,RestTemplate Observability support>> section.
[[rest-resttemplate-uri]]
==== URIs

2
framework-docs/src/docs/asciidoc/web/webflux-webclient.adoc
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@ -38,6 +38,8 @@ You can also use `WebClient.builder()` with further options:
* `filter`: Client filter for every request.
* `exchangeStrategies`: HTTP message reader/writer customizations.
* `clientConnector`: HTTP client library settings.
* `observationRegistry`: the registry to use for enabling <<integration.adoc#integration.observability.http-client.webclient, Observability support>>.
* `observationConvention`: <<integration.adoc#integration.observability.config,an optional, custom convention to extract metadata>> for recorded observations.
For example: