Skip to content

Update Prometheus client to 1.4.3 #8080

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
zeitlinger wants to merge 1 commit into
base: main
Choose a base branch
from
+17 −6
Open

Update Prometheus client to 1.4.3 #8080

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
2 changes: 1 addition & 1 deletion dependencyManagement/build.gradle.kts
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -15,7 +15,7 @@ val jmhVersion = "1.37"
val mockitoVersion = "4.11.0"
val slf4jVersion = "2.0.17"
val opencensusVersion = "0.31.1"
val prometheusServerVersion = "1.3.10"
val prometheusServerVersion = "1.4.3"
val armeriaVersion = "1.36.0"
val junitVersion = "5.14.2"
val okhttpVersion = "5.3.2"
Expand Down
19 changes: 15 additions & 4 deletions ...ometheus/src/main/java/io/opentelemetry/exporter/prometheus/Otel2PrometheusConverter.java
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,7 @@

package io.opentelemetry.exporter.prometheus;

import static io.prometheus.metrics.model.snapshots.PrometheusNaming.prometheusName;
import static io.prometheus.metrics.model.snapshots.PrometheusNaming.sanitizeLabelName;
import static io.prometheus.metrics.model.snapshots.PrometheusNaming.sanitizeMetricName;
import static java.util.Objects.requireNonNull;
Expand Down Expand Up @@ -474,7 +475,7 @@ private Labels convertAttributes(
attributes.forEach(
(key, value) ->
labelNameToValue.put(
sanitizeLabelName(key.getKey()), toLabelValue(key.getType(), value)));
convertLabelName(key.getKey()), toLabelValue(key.getType(), value)));

for (int i = 0; i < additionalAttributes.length; i += 2) {
labelNameToValue.putIfAbsent(
Expand Down Expand Up @@ -504,7 +505,7 @@ private Labels convertAttributes(
Object attributeValue = resourceAttributes.get(attributeKey);
if (attributeValue != null) {
labelNameToValue.putIfAbsent(
sanitizeLabelName(attributeKey.getKey()), attributeValue.toString());
convertLabelName(attributeKey.getKey()), attributeValue.toString());
}
}
}
Expand Down Expand Up @@ -544,14 +545,24 @@ private List<AttributeKey<?>> filterAllowedResourceAttributeKeys(@Nullable Resou
return allowedAttributeKeys;
}

/**
* Convert an attribute key to a legacy Prometheus label name. {@code prometheusName} converts
* non-standard characters (dots, dashes, etc.) to underscores, and {@code sanitizeLabelName}
* strips invalid leading prefixes.
*/
private static String convertLabelName(String key) {
return sanitizeLabelName(prometheusName(key));
Copy link
Member

@jack-berg jack-berg Feb 13, 2026

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

@zeitlinger when I look into the code I see prometheusName calls escapeName(String, EscapingScheme), where EscapingScheme is an enum with values: ALLOW_UTF8, UNDERSCORE_ESCAPING, DOTS_ESCAPING, VALUE_ENCODING_ESCAPING

And I've seen some hints in the code that the metric and attribute name escaping is influenced by headers requested by the client. Do we need to escape at all or will prometheus do we want by default?

Also, we've had offline conversations about the prometheus client library automatically appending suffixes like _total and units, and not providing an opt out mechanism, which makes it problematic for us in opentelemetry-java to implement the translation strategy option. Want to confirm this is still the case with this new version. Seems a bit strange that prometheus would have facilities to produce a full unescaped utf8 metric name but still always produces metric names with the suffixes.

}

private static MetricMetadata convertMetadata(MetricData metricData) {
String name = sanitizeMetricName(metricData.getName());
String name = sanitizeMetricName(prometheusName(metricData.getName()));
String help = metricData.getDescription();
Unit unit = PrometheusUnitsHelper.convertUnit(metricData.getUnit());
if (unit != null && !name.endsWith(unit.toString())) {
name = name + "_" + unit;
}
// Repeated __ are not allowed according to spec, although this is allowed in prometheus
// Repeated __ are discouraged according to spec, although this is allowed in prometheus, see
// https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/compatibility/prometheus_and_openmetrics.md#metric-metadata-1
while (name.contains("__")) {
name = name.replace("__", "_");
}
Expand Down
2 changes: 1 addition & 1 deletion ...ometheus/src/test/java/io/opentelemetry/exporter/prometheus/PrometheusHttpServerTest.java
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -46,7 +46,7 @@
import io.opentelemetry.sdk.resources.Resource;
import io.prometheus.metrics.exporter.httpserver.HTTPServer;
import io.prometheus.metrics.exporter.httpserver.MetricsHandler;
import io.prometheus.metrics.expositionformats.generated.com_google_protobuf_4_31_1.Metrics;
import io.prometheus.metrics.expositionformats.generated.com_google_protobuf_4_33_0.Metrics;
import io.prometheus.metrics.model.registry.PrometheusRegistry;
import java.io.ByteArrayInputStream;
import java.io.IOException;
Expand Down
Loading