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feat: expose Prometheus metrics at /metrics #2

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Merged
hujincalrin41 merged 1 commit into from
Jul 13, 2026
Merged

feat: expose Prometheus metrics at /metrics #2

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2 changes: 2 additions & 0 deletions build.sbt
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Original file line number Diff line number Diff line change
Expand Up @@ -328,6 +328,8 @@ lazy val server = (project in file("server"))
) ++ javacRelease17,
libraryDependencies ++= Seq(
"com.linecorp.armeria" % "armeria" % "1.28.4",
// Prometheus registry for armeria's MetricCollectingService + /metrics exposition.
"io.micrometer" % "micrometer-registry-prometheus" % "1.12.4",
"org.apache.commons" % "commons-lang3" % "3.19.0",

// Netty dependencies
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15 changes: 15 additions & 0 deletions server/src/main/java/io/unitycatalog/server/UnityCatalogServer.java
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Expand Up @@ -8,11 +8,16 @@
import com.fasterxml.jackson.databind.SerializationFeature;
import com.fasterxml.jackson.databind.json.JsonMapper;
import com.linecorp.armeria.common.HttpResponse;
import com.linecorp.armeria.common.metric.MeterIdPrefixFunction;
import com.linecorp.armeria.common.metric.PrometheusMeterRegistries;
import com.linecorp.armeria.server.Server;
import com.linecorp.armeria.server.ServerBuilder;
import com.linecorp.armeria.server.annotation.JacksonRequestConverterFunction;
import com.linecorp.armeria.server.annotation.JacksonResponseConverterFunction;
import com.linecorp.armeria.server.docs.DocService;
import com.linecorp.armeria.server.metric.MetricCollectingService;
import com.linecorp.armeria.server.metric.PrometheusExpositionService;
import io.micrometer.prometheus.PrometheusMeterRegistry;
import io.unitycatalog.server.auth.AllowingAuthorizer;
import io.unitycatalog.server.auth.JCasbinAuthorizer;
import io.unitycatalog.server.auth.UnityCatalogAuthorizer;
Expand Down Expand Up @@ -99,9 +104,19 @@ private void setDefaults(UnityCatalogServer.Builder unityCatalogServerBuilder) {
}

private Server initializeServer(UnityCatalogServer.Builder unityCatalogServerBuilder) {
// Expose Prometheus metrics at /metrics so per-route request counts (e.g.
// credential vending) are scrapeable. MetricCollectingService records every
// route; PrometheusExpositionService serves the registry.
PrometheusMeterRegistry meterRegistry = PrometheusMeterRegistries.newRegistry();
ServerBuilder armeriaServerBuilder =
Server.builder()
.http(unityCatalogServerBuilder.port)
.meterRegistry(meterRegistry)
.decorator(
MetricCollectingService.newDecorator(
MeterIdPrefixFunction.ofDefault("armeria.server")))
.service(
"/metrics", PrometheusExpositionService.of(meterRegistry.getPrometheusRegistry()))
.serviceUnder("/docs", new DocService());

// Init hibernate
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