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Make /metrics the only Prometheus metrics endpoint #6476

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merged 3 commits into from
May 29, 2024
Merged

Make /metrics the only Prometheus metrics endpoint #6476

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34b3d38
Make /metrics the only Prometheus metrics endpoint
fstab May 26, 2024
c7e1219
Add PrometheusHttpServerBuilder#setDefaultHandler
jack-berg May 29, 2024
a2f71a6
Merge branch 'main' of https://github.com/open-telemetry/opentelemetr…
jack-berg May 29, 2024
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2 changes: 0 additions & 2 deletions ...s/prometheus/src/main/java/io/opentelemetry/exporter/prometheus/PrometheusHttpServer.java
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Original file line number Diff line number Diff line change
Expand Up @@ -17,7 +17,6 @@
import io.opentelemetry.sdk.metrics.export.CollectionRegistration;
import io.opentelemetry.sdk.metrics.export.MetricReader;
import io.prometheus.metrics.exporter.httpserver.HTTPServer;
import io.prometheus.metrics.exporter.httpserver.MetricsHandler;
import io.prometheus.metrics.model.registry.PrometheusRegistry;
import java.io.IOException;
import java.io.UncheckedIOException;
Expand Down Expand Up @@ -84,7 +83,6 @@ public static PrometheusHttpServerBuilder builder() {
.port(port)
.executorService(executor)
.registry(prometheusRegistry)
.defaultHandler(new MetricsHandler(prometheusRegistry))
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Let's add a configuration option for this to PrometheusHttpServerBuilder:

public PrometheuesHttpServerBuilder setDefaultHandler(com.sun.net.httpserver.HttpHandler defaultHandler)

This will allow users to depend on this behavior to restore the current behavior (although it requires programmatic configuration) while aligning with standard prometheus client library behavior.

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I pushed a commit to add this but it broke the animalsniffer check because com.sun.net.httpserver.HttpHandler isn't available in the android API. Prometheus exporter doesn't need to support android environments, and doesn't work on them currently despite animalsniffer passing (animalsniffer apparently can't detect usage of unsupported APIs in dependencies).

I opened #6478 to separately address this. Can merge that, then merge main into this branch and merge this PR.

.buildAndStart();
} catch (IOException e) {
throw new UncheckedIOException("Could not create Prometheus HTTP server", e);
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4 changes: 2 additions & 2 deletions ...ometheus/src/test/java/io/opentelemetry/exporter/prometheus/PrometheusHttpServerTest.java
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Expand Up @@ -229,7 +229,7 @@ void fetchOpenMetrics() {
void fetchFiltered() {
AggregatedHttpResponse response =
client
.get("/?name[]=grpc_name_unit_total&name[]=bears_total&name[]=target_info")
.get("/metrics?name[]=grpc_name_unit_total&name[]=bears_total&name[]=target_info")
.aggregate()
.join();
assertThat(response.status()).isEqualTo(HttpStatus.OK);
Expand Down Expand Up @@ -275,7 +275,7 @@ void fetchPrometheusCompressed() throws IOException {
@SuppressWarnings("resource")
@Test
void fetchHead() {
AggregatedHttpResponse response = client.head("/").aggregate().join();
AggregatedHttpResponse response = client.head("/metrics").aggregate().join();
assertThat(response.status()).isEqualTo(HttpStatus.OK);
assertThat(response.headers().get(HttpHeaderNames.CONTENT_TYPE))
.isEqualTo("text/plain; version=0.0.4; charset=utf-8");
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