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Merged
sjaanus merged 3 commits into from
Dec 18, 2025
Merged

feat: start sending impact metrics in payload #341

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ecccf2e
feat: start sending impact metrics in payload
sjaanus Dec 18, 2025
62d26a2
Fix DI
sjaanus Dec 18, 2025
8c31733
Fix DI
sjaanus Dec 18, 2025
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16 changes: 15 additions & 1 deletion src/main/java/io/getunleash/metric/UnleashMetricServiceImpl.java
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Original file line number Diff line number Diff line change
Expand Up @@ -2,11 +2,14 @@

import io.getunleash.engine.MetricsBucket;
import io.getunleash.engine.UnleashEngine;
import io.getunleash.impactmetrics.CollectedMetric;
import io.getunleash.impactmetrics.ImpactMetricsDataSource;
import io.getunleash.util.Throttler;
import io.getunleash.util.UnleashConfig;
import io.getunleash.util.UnleashScheduledExecutor;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.util.List;
import java.util.Set;

public class UnleashMetricServiceImpl implements UnleashMetricService {
Expand All @@ -19,6 +22,8 @@ public class UnleashMetricServiceImpl implements UnleashMetricService {

private final Throttler throttler;

private final ImpactMetricsDataSource impactMetricsRegistry;

public UnleashMetricServiceImpl(
UnleashConfig unleashConfig, UnleashScheduledExecutor executor, UnleashEngine engine) {
this(
Expand All @@ -42,6 +47,7 @@ public UnleashMetricServiceImpl(
300,
unleashConfig.getUnleashURLs().getClientMetricsURL());
this.engine = engine;
this.impactMetricsRegistry = unleashConfig.getImpactMetricsRegistry();
long metricsInterval = unleashConfig.getSendMetricsInterval();

executor.setInterval(sendMetrics(), metricsInterval, metricsInterval);
Expand All @@ -59,13 +65,21 @@ private Runnable sendMetrics() {
if (throttler.performAction()) {
MetricsBucket bucket = this.engine.getMetrics();

ClientMetrics metrics = new ClientMetrics(unleashConfig, bucket);
List<CollectedMetric> impactMetrics = impactMetricsRegistry.collect();
List<CollectedMetric> impactMetricsOrNull =
impactMetrics.isEmpty() ? null : impactMetrics;

ClientMetrics metrics =
new ClientMetrics(unleashConfig, bucket, impactMetricsOrNull);
Comment on lines +69 to +73
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@sjaanus sjaanus Dec 18, 2025

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There is design from node SDK, that if we do not have any metrics, we do not add the empty array to payload.

int statusCode = metricSender.sendMetrics(metrics);
if (statusCode >= 200 && statusCode < 400) {
throttler.decrementFailureCountAndResetSkips();
}
if (statusCode >= 400) {
throttler.handleHttpErrorCodes(statusCode);
if (impactMetricsOrNull != null) {
impactMetricsRegistry.restore(impactMetricsOrNull);
}
}

} else {
Expand Down
9 changes: 5 additions & 4 deletions src/main/java/io/getunleash/util/UnleashConfig.java
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Expand Up @@ -7,6 +7,7 @@
import io.getunleash.event.NoOpSubscriber;
import io.getunleash.event.UnleashSubscriber;
import io.getunleash.impactmetrics.ImpactMetricsDataSource;
import io.getunleash.impactmetrics.InMemoryMetricRegistry;
import io.getunleash.lang.Nullable;
import io.getunleash.metric.DefaultHttpMetricsSender;
import io.getunleash.repository.HttpFeatureFetcher;
Expand Down Expand Up @@ -74,7 +75,7 @@ public class UnleashConfig {
@Nullable private final ToggleBootstrapProvider toggleBootstrapProvider;
@Nullable private final Proxy proxy;
@Nullable private final Consumer<UnleashException> startupExceptionHandler;
@Nullable private final ImpactMetricsDataSource impactMetricsRegistry;
private final ImpactMetricsDataSource impactMetricsRegistry;

private UnleashConfig(
@Nullable URI unleashAPI,
Expand Down Expand Up @@ -109,7 +110,7 @@ private UnleashConfig(
@Nullable Proxy proxy,
@Nullable Authenticator proxyAuthenticator,
@Nullable Consumer<UnleashException> startupExceptionHandler,
@Nullable ImpactMetricsDataSource impactMetricsRegistry) {
ImpactMetricsDataSource impactMetricsRegistry) {

if (appName == null) {
throw new IllegalStateException("You are required to specify the unleash appName");
Expand Down Expand Up @@ -356,7 +357,6 @@ public Proxy getProxy() {
return proxy;
}

@Nullable
public ImpactMetricsDataSource getImpactMetricsRegistry() {
return impactMetricsRegistry;
}
Expand Down Expand Up @@ -766,7 +766,8 @@ public UnleashConfig build() {
proxy,
proxyAuthenticator,
startupExceptionHandler,
impactMetricsRegistry);
Optional.ofNullable(impactMetricsRegistry)
.orElseGet(InMemoryMetricRegistry::new));
}

public String getDefaultSdkVersion() {
Expand Down
59 changes: 0 additions & 59 deletions src/test/java/io/getunleash/impactmetrics/MetricTypeTest.java
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Expand Up @@ -2,9 +2,6 @@

import static org.assertj.core.api.Assertions.assertThat;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import io.getunleash.util.HistogramBucketSerializer;
import java.util.Collections;
import java.util.List;
import java.util.Map;
Expand Down Expand Up @@ -303,60 +300,4 @@ private NumericMetricSample sample(long value) {
private NumericMetricSample sample(Map<String, String> labels, long value) {
return new NumericMetricSample(labels, value);
}

@Test
public void should_serialize_histogram_with_positive_infinity_as_plus_inf_string() {
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@sjaanus sjaanus Dec 18, 2025

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Moving this to http level, so we can catch also if serializer was not mounted.

InMemoryMetricRegistry registry = new InMemoryMetricRegistry();
Histogram histogram =
registry.histogram(
new BucketMetricOptions(
"serialization_test", "test serialization", List.of(1.0, 5.0)));

histogram.observe(10.0, Map.of("env", "prod"));

List<CollectedMetric> metrics = registry.collect();
assertThat(metrics).hasSize(1);

Gson gson =
new GsonBuilder()
.registerTypeAdapter(HistogramBucket.class, new HistogramBucketSerializer())
.create();

String json = gson.toJson(metrics.get(0));

assertThat(json).contains("\"le\":\"+Inf\"");
assertThat(json).contains("\"le\":1.0");
assertThat(json).contains("\"le\":5.0");
}

@Test
public void should_serialize_histogram_buckets_correctly() {
InMemoryMetricRegistry registry = new InMemoryMetricRegistry();
Histogram histogram =
registry.histogram(
new BucketMetricOptions(
"bucket_serialization", "test buckets", List.of(0.5, 2.0)));

histogram.observe(0.3);
histogram.observe(1.5);
histogram.observe(10.0);

List<CollectedMetric> metrics = registry.collect();
assertThat(metrics).hasSize(1);

BucketMetricSample sample = (BucketMetricSample) metrics.get(0).getSamples().get(0);
assertThat(sample.getBuckets()).hasSize(3);

Gson gson =
new GsonBuilder()
.registerTypeAdapter(HistogramBucket.class, new HistogramBucketSerializer())
.create();

String json = gson.toJson(sample);

assertThat(json).contains("\"le\":0.5");
assertThat(json).contains("\"le\":2.0");
assertThat(json).contains("\"le\":\"+Inf\"");
assertThat(json).contains("\"count\":");
}
}
45 changes: 45 additions & 0 deletions src/test/java/io/getunleash/metric/DefaultHttpMetricsSenderTest.java
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Expand Up @@ -14,12 +14,17 @@

import com.github.tomakehurst.wiremock.junit5.WireMockExtension;
import io.getunleash.engine.MetricsBucket;
import io.getunleash.impactmetrics.BucketMetricOptions;
import io.getunleash.impactmetrics.CollectedMetric;
import io.getunleash.impactmetrics.Histogram;
import io.getunleash.impactmetrics.InMemoryMetricRegistry;
import io.getunleash.util.UnleashConfig;
import java.net.URI;
import java.net.URISyntaxException;
import java.time.Instant;
import java.time.LocalDateTime;
import java.util.HashSet;
import java.util.List;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.RegisterExtension;

Expand Down Expand Up @@ -108,4 +113,44 @@ public void should_handle_service_failure_when_sending_metrics() throws URISynta
.withHeader(UNLEASH_INTERVAL, matching(String.valueOf(metricsInterval)))
.withHeader("UNLEASH-APPNAME", matching("test-app")));
}

@Test
public void should_send_impact_metrics_with_histogram_and_plus_inf_bucket()
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@sjaanus sjaanus Dec 18, 2025

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Following the java test style, we verify that +Inf is being sent.

throws URISyntaxException {
stubFor(
post(urlEqualTo("/client/metrics"))
.withHeader("UNLEASH-APPNAME", matching("test-app"))
.willReturn(aResponse().withStatus(200)));

URI uri = new URI("http://localhost:" + serverMock.getPort());
UnleashConfig config = UnleashConfig.builder().appName("test-app").unleashAPI(uri).build();

InMemoryMetricRegistry registry = new InMemoryMetricRegistry();
Histogram histogram =
registry.histogram(
new BucketMetricOptions(
"test_histogram", "testing histogram", List.of(1.0, 5.0)));

histogram.observe(0.5);
histogram.observe(10.0);

List<CollectedMetric> impactMetrics = registry.collect();

DefaultHttpMetricsSender sender = new DefaultHttpMetricsSender(config);
MetricsBucket bucket = new MetricsBucket(Instant.now(), Instant.now(), null);
ClientMetrics metrics = new ClientMetrics(config, bucket, impactMetrics);
sender.sendMetrics(metrics);

verify(
postRequestedFor(urlMatching("/client/metrics"))
.withRequestBody(matching(".*\"impactMetrics\".*"))
.withRequestBody(matching(".*\"name\"\\s*:\\s*\"test_histogram\".*"))
.withRequestBody(matching(".*\"type\"\\s*:\\s*\"HISTOGRAM\".*"))
.withRequestBody(matching(".*\"le\"\\s*:\\s*\"\\+Inf\".*"))
.withHeader(
UNLEASH_INTERVAL, matching(config.getSendMetricsIntervalMillis()))
.withHeader(
UNLEASH_CONNECTION_ID_HEADER, matching(config.getConnectionId()))
.withHeader("UNLEASH-APPNAME", matching("test-app")));
}
}
127 changes: 127 additions & 0 deletions src/test/java/io/getunleash/metric/UnleashMetricServiceImplTest.java
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Expand Up @@ -8,10 +8,14 @@
import io.getunleash.engine.UnleashEngine;
import io.getunleash.engine.YggdrasilError;
import io.getunleash.engine.YggdrasilInvalidInputException;
import io.getunleash.impactmetrics.CollectedMetric;
import io.getunleash.impactmetrics.ImpactMetricsDataSource;
import io.getunleash.util.UnleashConfig;
import io.getunleash.util.UnleashScheduledExecutor;
import java.time.LocalDateTime;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import org.junit.jupiter.api.Test;
import org.mockito.ArgumentCaptor;
Expand Down Expand Up @@ -359,6 +363,129 @@ public void url_not_found_immediately_increases_interval_to_max() throws Yggdras
assertThat(unleashMetricService.getSkips()).isEqualTo(0);
}

@Test
public void should_include_impact_metrics_in_clientmetrics_payload() throws YggdrasilError {
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These tests are same as in node SDK.

UnleashConfig config =
UnleashConfig.builder()
.appName("test")
.sendMetricsInterval(10)
.unleashAPI("http://unleash.com")
.impactMetricsRegistry(mock(ImpactMetricsDataSource.class))
.build();

UnleashScheduledExecutor executor = mock(UnleashScheduledExecutor.class);
DefaultHttpMetricsSender sender = mock(DefaultHttpMetricsSender.class);
UnleashEngine engine = new UnleashEngine();
ImpactMetricsDataSource registry = mock(ImpactMetricsDataSource.class);

CollectedMetric sample =
new CollectedMetric(
"feature_toggle_used",
"tracks toggle usage",
io.getunleash.impactmetrics.MetricType.COUNTER,
Collections.emptyList());
when(registry.collect()).thenReturn(List.of(sample));

UnleashConfig configWithRegistry =
UnleashConfig.builder()
.appName("test")
.sendMetricsInterval(10)
.unleashAPI("http://unleash.com")
.impactMetricsRegistry(registry)
.build();

UnleashMetricServiceImpl unleashMetricService =
new UnleashMetricServiceImpl(configWithRegistry, sender, executor, engine);

ArgumentCaptor<Runnable> sendMetricsCallback = ArgumentCaptor.forClass(Runnable.class);
verify(executor).setInterval(sendMetricsCallback.capture(), anyLong(), anyLong());

when(sender.sendMetrics(any(ClientMetrics.class))).thenReturn(200);

sendMetricsCallback.getValue().run();

ArgumentCaptor<ClientMetrics> cmCaptor = ArgumentCaptor.forClass(ClientMetrics.class);
verify(sender).sendMetrics(cmCaptor.capture());

ClientMetrics metricsSent = cmCaptor.getValue();
assertThat(metricsSent.getImpactMetrics()).isNotNull();
assertThat(metricsSent.getImpactMetrics()).hasSize(1);
assertThat(metricsSent.getImpactMetrics().get(0).getName())
.isEqualTo("feature_toggle_used");
}

@Test
public void should_restore_impact_metrics_on_failure() throws YggdrasilError {
ImpactMetricsDataSource registry = mock(ImpactMetricsDataSource.class);

CollectedMetric sample =
new CollectedMetric(
"feature_toggle_used",
"tracks toggle usage",
io.getunleash.impactmetrics.MetricType.COUNTER,
Collections.emptyList());
when(registry.collect()).thenReturn(List.of(sample));

UnleashConfig config =
UnleashConfig.builder()
.appName("test")
.sendMetricsInterval(10)
.unleashAPI("http://unleash.com")
.impactMetricsRegistry(registry)
.build();

UnleashScheduledExecutor executor = mock(UnleashScheduledExecutor.class);
DefaultHttpMetricsSender sender = mock(DefaultHttpMetricsSender.class);
UnleashEngine engine = new UnleashEngine();

UnleashMetricServiceImpl unleashMetricService =
new UnleashMetricServiceImpl(config, sender, executor, engine);

ArgumentCaptor<Runnable> sendMetricsCallback = ArgumentCaptor.forClass(Runnable.class);
verify(executor).setInterval(sendMetricsCallback.capture(), anyLong(), anyLong());

when(sender.sendMetrics(any(ClientMetrics.class))).thenReturn(500);

sendMetricsCallback.getValue().run();

verify(registry, times(1)).restore(List.of(sample));
}

@Test
public void should_not_include_impact_metrics_field_when_empty() throws YggdrasilError {
ImpactMetricsDataSource registry = mock(ImpactMetricsDataSource.class);
when(registry.collect()).thenReturn(Collections.emptyList());

UnleashConfig config =
UnleashConfig.builder()
.appName("test")
.sendMetricsInterval(10)
.unleashAPI("http://unleash.com")
.impactMetricsRegistry(registry)
.build();

UnleashScheduledExecutor executor = mock(UnleashScheduledExecutor.class);
DefaultHttpMetricsSender sender = mock(DefaultHttpMetricsSender.class);
UnleashEngine engine = new UnleashEngine();

UnleashMetricServiceImpl unleashMetricService =
new UnleashMetricServiceImpl(config, sender, executor, engine);

ArgumentCaptor<Runnable> sendMetricsCallback = ArgumentCaptor.forClass(Runnable.class);
verify(executor).setInterval(sendMetricsCallback.capture(), anyLong(), anyLong());

when(sender.sendMetrics(any(ClientMetrics.class))).thenReturn(200);

sendMetricsCallback.getValue().run();

ArgumentCaptor<ClientMetrics> cmCaptor = ArgumentCaptor.forClass(ClientMetrics.class);
verify(sender).sendMetrics(cmCaptor.capture());

ClientMetrics metricsSent = cmCaptor.getValue();
assertThat(metricsSent.getImpactMetrics()).isNull();
verify(registry, times(1)).collect();
}

@Test
public void should_add_new_metrics_data_to_bucket() {
UnleashConfig config =
Expand Down
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