Add HTTP server and client active network connection gauge metrics

[i-m-addycoder]

Add new HTTP Server http_server_active_connections and Client http_client_active_connections gauge metrics.

The client metric will be available (just like many other such client metrics) only when the client is registered with metrics name programmatically as below:

var httpClientOptions = new HttpClientOptions().setMetricsName("|localhost"); // IMPORTANT!
        
externalService = QuarkusRestClientBuilder.newBuilder()
    .baseUri(URI.create("http://localhost:8081"))
    .httpClientOptions(httpClientOptions) // IMPORTANT!
    .build(ExternalService.class);

where ExternalService is a Rest Client interface.

Another approach: I couldn't find a way to register the metrics name through annotations, so using @RestClient annotation will not register this metric along with some other metrics which fall into the same category unless ContextResolver for HttpClientOptions is registered as given here .

[quarkus-bot]

/cc @brunobat (micrometer), @ebullient (micrometer)

[brunobat]

Sorry @i-m-addycoder we need tests for this feature.
Please check

quarkus/extensions/micrometer/deployment/src/test/java/io/quarkus/micrometer/deployment/binder/VertxHttpClientMetricsTest.java

Line 38 in 54d7af1

public class VertxHttpClientMetricsTest {

[i-m-addycoder]

Apologies @brunobat for missing the tests. Added assertions to the test class :)

[quarkus-bot]

Status for workflow Quarkus CI

This is the status report for running Quarkus CI on commit 55e9fc9.

✅ The latest workflow run for the pull request has completed successfully.

It should be safe to merge provided you have a look at the other checks in the summary.

You can consult the Develocity build scans.

---

Flaky tests - Develocity

⚙️ JVM Tests - JDK 17 Windows

📦 extensions/micrometer-opentelemetry/deployment

✖ io.quarkus.micrometer.opentelemetry.deployment.compatibility.MicrometerTimedInterceptorTest.testTimeMethod_LongTaskTimer_Uni - History

• expected: <0> but was: <1> - org.opentest4j.AssertionFailedError

org.opentest4j.AssertionFailedError: expected: <0> but was: <1>
	at org.junit.jupiter.api.AssertionFailureBuilder.build(AssertionFailureBuilder.java:151)
	at org.junit.jupiter.api.AssertionFailureBuilder.buildAndThrow(AssertionFailureBuilder.java:132)
	at org.junit.jupiter.api.AssertEquals.failNotEqual(AssertEquals.java:197)
	at org.junit.jupiter.api.AssertEquals.assertEquals(AssertEquals.java:166)
	at org.junit.jupiter.api.AssertEquals.assertEquals(AssertEquals.java:161)
	at org.junit.jupiter.api.Assertions.assertEquals(Assertions.java:632)
	at io.quarkus.micrometer.opentelemetry.deployment.compatibility.MicrometerTimedInterceptorTest.testTimeMethod_LongTaskTimer_Uni(MicrometerTimedInterceptorTest.java:267)

[brunobat]

I've used it and seems good to go.