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https://issues.apache.org/jira/browse/HTTPCLIENT-2274?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17722091#comment-17722091
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Oleg Kalnichevski commented on HTTPCLIENT-2274:
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[~cachescrubber] You should be using exec interceptors to capture execution
time metrics:
https://github.com/apache/httpcomponents-client/blob/master/httpclient5/src/test/java/org/apache/hc/client5/http/examples/ClientInterceptors.java
https://github.com/apache/httpcomponents-client/blob/master/httpclient5/src/test/java/org/apache/hc/client5/http/examples/AsyncClientInterceptors.java
Oleg
> Instrumenting HttpClient to gather http client request metrics.
> ---------------------------------------------------------------
>
> Key: HTTPCLIENT-2274
> URL: https://issues.apache.org/jira/browse/HTTPCLIENT-2274
> Project: HttpComponents HttpClient
> Issue Type: Improvement
> Components: HttpClient (async), HttpClient (classic)
> Affects Versions: 5.2.1
> Reporter: Lars Uffmann
> Priority: Major
>
> I recently started using the [micrometer|[https://micrometer.io/]] binding
> for HttpClient version 4 and 5, b both classic and async.
> Digging a bit deeper into the implementation I noticed that the async
> instrumentation is not able to measure IO errors.
> My attempt to solve this
> ([https://github.com/micrometer-metrics/micrometer/pull/3801)|https://github.com/micrometer-metrics/micrometer/pull/3801]
> is using a HttpRequestRetryStrategy to capture exceptions. Not only it feels
> a bit awkward using the retry strategy to meter errors, I discovered that
> only errors occurring during an established connection could be metered.
> Connection related IO errors (connection refused, connection timeout, etc.)
> are not metered.
> The issue seems to be that the RequestInterceptor used to start then
> observation, is not called before a connection is established. I see the same
> behavior with the classic http client instrumentation which is using a
> HttpRequestExecutor, not an Interceptor.
> This means
> * the metrics do not include the time needed to establish a connection.
> * The metrics do not count failed connection attempts.
> Could you advise on how to instrument HttpClient (classic and async) in order
> to be able to meter connection related time and errors?
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