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Bring metrics exemplar filter and reservoir out of internal #7636

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e5f07c1
remove internal/experimental wording around exemplar stuff
breedx-splk Sep 3, 2025
0f5e0a8
make setter public and remove experimental note
breedx-splk Sep 3, 2025
fca1416
deprecate util method and suggest calling it directly
breedx-splk Sep 3, 2025
ad832a2
repackage exemplars (make non-internal)
breedx-splk Sep 3, 2025
6b0589a
repackage exemplars tests
breedx-splk Sep 3, 2025
3269221
add test to ensure backwards compat
breedx-splk Sep 3, 2025
b96c52c
spotless
breedx-splk Sep 3, 2025
44887f9
fix up remaining usages, regen sdk apidiff
breedx-splk Sep 3, 2025
eb19261
manually update versions (perhaps this helps, who knows)
breedx-splk Sep 10, 2025
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46 changes: 45 additions & 1 deletion docs/apidiffs/current_vs_latest/opentelemetry-sdk-metrics.txt
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@@ -1,2 +1,46 @@
Comparing source compatibility of opentelemetry-sdk-metrics-1.55.0-SNAPSHOT.jar against opentelemetry-sdk-metrics-1.54.0.jar
No changes.
+++ NEW CLASS: PUBLIC(+) FINAL(+) io.opentelemetry.sdk.metrics.exemplar.AlwaysOffFilter (not serializable)
+++ CLASS FILE FORMAT VERSION: 52.0 <- n.a.
+++ NEW INTERFACE: io.opentelemetry.sdk.metrics.exemplar.ExemplarFilter
+++ NEW SUPERCLASS: java.lang.Object
+++ NEW METHOD: PUBLIC(+) boolean shouldSampleMeasurement(long, io.opentelemetry.api.common.Attributes, io.opentelemetry.context.Context)
+++ NEW METHOD: PUBLIC(+) boolean shouldSampleMeasurement(double, io.opentelemetry.api.common.Attributes, io.opentelemetry.context.Context)
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Some changes were made from the original exemplar design vs. what was ultimately marked stable. Notably, ExemplarFilter is no longer a extension plugin interface. See the difference in language between ExemplarFilter and ExemplarReservoir which is a extension plugin interface:

  • ExemplarFilter: "The ExemplarFilter configuration MUST allow users to select between one of the built-in ExemplarFilters."
  • ExemplarReservoir: "The ExemplarReservoir interface MUST provide a method to offer measurements to the reservoir and another to collect accumulated Exemplars."

We need to adjust our API for ExemplarFilter accordingly. Its actually conceptually similar to our Aggregation: modeled as an interface with no methods, with the actual meaningful interface / methods in the internal AggregationFactory.

+++ NEW CLASS: PUBLIC(+) FINAL(+) io.opentelemetry.sdk.metrics.exemplar.AlwaysOnFilter (not serializable)
+++ CLASS FILE FORMAT VERSION: 52.0 <- n.a.
+++ NEW INTERFACE: io.opentelemetry.sdk.metrics.exemplar.ExemplarFilter
+++ NEW SUPERCLASS: java.lang.Object
+++ NEW METHOD: PUBLIC(+) boolean shouldSampleMeasurement(long, io.opentelemetry.api.common.Attributes, io.opentelemetry.context.Context)
+++ NEW METHOD: PUBLIC(+) boolean shouldSampleMeasurement(double, io.opentelemetry.api.common.Attributes, io.opentelemetry.context.Context)
+++ NEW INTERFACE: PUBLIC(+) ABSTRACT(+) io.opentelemetry.sdk.metrics.exemplar.ExemplarFilter (not serializable)
+++ CLASS FILE FORMAT VERSION: 52.0 <- n.a.
+++ NEW SUPERCLASS: java.lang.Object
+++ NEW METHOD: PUBLIC(+) STATIC(+) io.opentelemetry.sdk.metrics.exemplar.ExemplarFilter alwaysOff()
+++ NEW METHOD: PUBLIC(+) STATIC(+) io.opentelemetry.sdk.metrics.exemplar.ExemplarFilter alwaysOn()
+++ NEW METHOD: PUBLIC(+) ABSTRACT(+) boolean shouldSampleMeasurement(long, io.opentelemetry.api.common.Attributes, io.opentelemetry.context.Context)
+++ NEW METHOD: PUBLIC(+) ABSTRACT(+) boolean shouldSampleMeasurement(double, io.opentelemetry.api.common.Attributes, io.opentelemetry.context.Context)
+++ NEW METHOD: PUBLIC(+) STATIC(+) io.opentelemetry.sdk.metrics.exemplar.ExemplarFilter traceBased()
+++ NEW INTERFACE: PUBLIC(+) ABSTRACT(+) io.opentelemetry.sdk.metrics.exemplar.ExemplarReservoir (not serializable)
+++ CLASS FILE FORMAT VERSION: 52.0 <- n.a.
GENERIC TEMPLATES: +++ T:io.opentelemetry.sdk.metrics.data.ExemplarData
+++ NEW SUPERCLASS: java.lang.Object
+++ NEW METHOD: PUBLIC(+) ABSTRACT(+) java.util.List<T> collectAndReset(io.opentelemetry.api.common.Attributes)
+++ NEW METHOD: PUBLIC(+) STATIC(+) io.opentelemetry.sdk.metrics.exemplar.ExemplarReservoir<io.opentelemetry.sdk.metrics.data.DoubleExemplarData> doubleFixedSizeReservoir(io.opentelemetry.sdk.common.Clock, int, java.util.function.Supplier<java.util.Random>)
+++ NEW METHOD: PUBLIC(+) STATIC(+) io.opentelemetry.sdk.metrics.exemplar.ExemplarReservoir<io.opentelemetry.sdk.metrics.data.DoubleExemplarData> doubleNoSamples()
+++ NEW METHOD: PUBLIC(+) STATIC(+) io.opentelemetry.sdk.metrics.exemplar.ExemplarReservoir<T> filtered(io.opentelemetry.sdk.metrics.exemplar.ExemplarFilter, io.opentelemetry.sdk.metrics.exemplar.ExemplarReservoir<T>)
GENERIC TEMPLATES: +++ T:io.opentelemetry.sdk.metrics.data.ExemplarData
+++ NEW METHOD: PUBLIC(+) STATIC(+) io.opentelemetry.sdk.metrics.exemplar.ExemplarReservoir<io.opentelemetry.sdk.metrics.data.DoubleExemplarData> histogramBucketReservoir(io.opentelemetry.sdk.common.Clock, java.util.List<java.lang.Double>)
+++ NEW METHOD: PUBLIC(+) STATIC(+) io.opentelemetry.sdk.metrics.exemplar.ExemplarReservoir<io.opentelemetry.sdk.metrics.data.LongExemplarData> longFixedSizeReservoir(io.opentelemetry.sdk.common.Clock, int, java.util.function.Supplier<java.util.Random>)
+++ NEW METHOD: PUBLIC(+) STATIC(+) io.opentelemetry.sdk.metrics.exemplar.ExemplarReservoir<io.opentelemetry.sdk.metrics.data.LongExemplarData> longNoSamples()
+++ NEW METHOD: PUBLIC(+) STATIC(+) io.opentelemetry.sdk.metrics.exemplar.ExemplarReservoir<T> longToDouble(io.opentelemetry.sdk.metrics.exemplar.ExemplarReservoir<T>)
GENERIC TEMPLATES: +++ T:io.opentelemetry.sdk.metrics.data.ExemplarData
+++ NEW METHOD: PUBLIC(+) ABSTRACT(+) void offerDoubleMeasurement(double, io.opentelemetry.api.common.Attributes, io.opentelemetry.context.Context)
+++ NEW METHOD: PUBLIC(+) ABSTRACT(+) void offerLongMeasurement(long, io.opentelemetry.api.common.Attributes, io.opentelemetry.context.Context)
+++ NEW CLASS: PUBLIC(+) FINAL(+) io.opentelemetry.sdk.metrics.exemplar.TraceBasedExemplarFilter (not serializable)
+++ CLASS FILE FORMAT VERSION: 52.0 <- n.a.
+++ NEW INTERFACE: io.opentelemetry.sdk.metrics.exemplar.ExemplarFilter
+++ NEW SUPERCLASS: java.lang.Object
+++ NEW METHOD: PUBLIC(+) boolean shouldSampleMeasurement(long, io.opentelemetry.api.common.Attributes, io.opentelemetry.context.Context)
+++ NEW METHOD: PUBLIC(+) boolean shouldSampleMeasurement(double, io.opentelemetry.api.common.Attributes, io.opentelemetry.context.Context)
*** MODIFIED CLASS: PUBLIC FINAL io.opentelemetry.sdk.metrics.SdkMeterProviderBuilder (not serializable)
=== CLASS FILE FORMAT VERSION: 52.0 <- 52.0
+++ NEW METHOD: PUBLIC(+) io.opentelemetry.sdk.metrics.SdkMeterProviderBuilder setExemplarFilter(io.opentelemetry.sdk.metrics.exemplar.ExemplarFilter)
5 changes: 2 additions & 3 deletions ...ests/otlp/src/main/java/io/opentelemetry/integrationtest/OtlpExporterIntegrationTest.java
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Expand Up @@ -67,10 +67,9 @@
import io.opentelemetry.sdk.logs.export.LogRecordExporter;
import io.opentelemetry.sdk.metrics.SdkMeterProvider;
import io.opentelemetry.sdk.metrics.SdkMeterProviderBuilder;
import io.opentelemetry.sdk.metrics.exemplar.ExemplarFilter;
import io.opentelemetry.sdk.metrics.export.MetricExporter;
import io.opentelemetry.sdk.metrics.export.PeriodicMetricReader;
import io.opentelemetry.sdk.metrics.internal.SdkMeterProviderUtil;
import io.opentelemetry.sdk.metrics.internal.exemplar.ExemplarFilter;
import io.opentelemetry.sdk.resources.Resource;
import io.opentelemetry.sdk.trace.IdGenerator;
import io.opentelemetry.sdk.trace.SdkTracerProvider;
Expand Down Expand Up @@ -470,7 +469,7 @@ private static void testMetricExport(MetricExporter metricExporter) {
.build());

// Enable alwaysOn exemplar filter, instead of default traceBased filter
SdkMeterProviderUtil.setExemplarFilter(meterProviderBuilder, ExemplarFilter.alwaysOn());
meterProviderBuilder.setExemplarFilter(ExemplarFilter.alwaysOn());

SdkMeterProvider meterProvider = meterProviderBuilder.build();

Expand Down
33 changes: 17 additions & 16 deletions ...onfigure/src/main/java/io/opentelemetry/sdk/autoconfigure/MeterProviderConfiguration.java
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Expand Up @@ -10,10 +10,9 @@
import io.opentelemetry.sdk.autoconfigure.spi.ConfigurationException;
import io.opentelemetry.sdk.autoconfigure.spi.internal.DefaultConfigProperties;
import io.opentelemetry.sdk.metrics.SdkMeterProviderBuilder;
import io.opentelemetry.sdk.metrics.exemplar.ExemplarFilter;
import io.opentelemetry.sdk.metrics.export.MetricExporter;
import io.opentelemetry.sdk.metrics.export.MetricReader;
import io.opentelemetry.sdk.metrics.internal.SdkMeterProviderUtil;
import io.opentelemetry.sdk.metrics.internal.exemplar.ExemplarFilter;
import io.opentelemetry.sdk.metrics.internal.state.MetricStorage;
import java.io.Closeable;
import java.util.Collections;
Expand All @@ -39,20 +38,8 @@ static void configureMeterProvider(
List<Closeable> closeables) {

// Configure default exemplar filters.
String exemplarFilter =
config.getString("otel.metrics.exemplar.filter", "trace_based").toLowerCase(Locale.ROOT);
switch (exemplarFilter) {
case "always_off":
SdkMeterProviderUtil.setExemplarFilter(meterProviderBuilder, ExemplarFilter.alwaysOff());
break;
case "always_on":
SdkMeterProviderUtil.setExemplarFilter(meterProviderBuilder, ExemplarFilter.alwaysOn());
break;
case "trace_based":
default:
SdkMeterProviderUtil.setExemplarFilter(meterProviderBuilder, ExemplarFilter.traceBased());
break;
}
ExemplarFilter filter = getExemplarFilter(config);
meterProviderBuilder.setExemplarFilter(filter);

Integer cardinalityLimit = config.getInt("otel.java.metrics.cardinality.limit");
if (cardinalityLimit == null) {
Expand All @@ -76,6 +63,20 @@ static void configureMeterProvider(
reader, instrumentType -> resolvedCardinalityLimit));
}

private static ExemplarFilter getExemplarFilter(ConfigProperties config) {
String exemplarFilter =
config.getString("otel.metrics.exemplar.filter", "trace_based").toLowerCase(Locale.ROOT);
switch (exemplarFilter) {
case "always_off":
return ExemplarFilter.alwaysOff();
case "always_on":
return ExemplarFilter.alwaysOn();
case "trace_based":
default:
return ExemplarFilter.traceBased();
}
}

static List<MetricReader> configureMetricReaders(
ConfigProperties config,
SpiHelper spiHelper,
Expand Down
8 changes: 4 additions & 4 deletions ...gure/src/test/java/io/opentelemetry/sdk/autoconfigure/MeterProviderConfigurationTest.java
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Expand Up @@ -12,10 +12,10 @@
import io.opentelemetry.sdk.autoconfigure.spi.internal.DefaultConfigProperties;
import io.opentelemetry.sdk.metrics.SdkMeterProvider;
import io.opentelemetry.sdk.metrics.SdkMeterProviderBuilder;
import io.opentelemetry.sdk.metrics.internal.exemplar.AlwaysOffFilter;
import io.opentelemetry.sdk.metrics.internal.exemplar.AlwaysOnFilter;
import io.opentelemetry.sdk.metrics.internal.exemplar.ExemplarFilter;
import io.opentelemetry.sdk.metrics.internal.exemplar.TraceBasedExemplarFilter;
import io.opentelemetry.sdk.metrics.exemplar.AlwaysOffFilter;
import io.opentelemetry.sdk.metrics.exemplar.AlwaysOnFilter;
import io.opentelemetry.sdk.metrics.exemplar.ExemplarFilter;
import io.opentelemetry.sdk.metrics.exemplar.TraceBasedExemplarFilter;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
Expand Down
2 changes: 1 addition & 1 deletion sdk/metrics/src/jmh/java/io/opentelemetry/sdk/metrics/TestSdk.java
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Expand Up @@ -9,7 +9,7 @@
import io.opentelemetry.api.metrics.MeterProvider;
import io.opentelemetry.api.trace.Tracer;
import io.opentelemetry.sdk.common.Clock;
import io.opentelemetry.sdk.metrics.internal.exemplar.ExemplarFilter;
import io.opentelemetry.sdk.metrics.exemplar.ExemplarFilter;
import io.opentelemetry.sdk.resources.Resource;
import io.opentelemetry.sdk.testing.exporter.InMemoryMetricReader;
import io.opentelemetry.sdk.trace.SdkTracerProvider;
Expand Down
2 changes: 1 addition & 1 deletion .../jmh/java/io/opentelemetry/sdk/metrics/internal/aggregator/HistogramAggregationParam.java
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Expand Up @@ -7,7 +7,7 @@

import static io.opentelemetry.sdk.common.export.MemoryMode.IMMUTABLE_DATA;

import io.opentelemetry.sdk.metrics.internal.exemplar.ExemplarReservoir;
import io.opentelemetry.sdk.metrics.exemplar.ExemplarReservoir;
import java.util.Collections;

/** The types of histogram aggregation to benchmark. */
Expand Down
5 changes: 2 additions & 3 deletions .../jmh/java/io/opentelemetry/sdk/metrics/internal/aggregator/HistogramCollectBenchmark.java
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Expand Up @@ -14,10 +14,9 @@
import io.opentelemetry.sdk.metrics.SdkMeterProviderBuilder;
import io.opentelemetry.sdk.metrics.data.AggregationTemporality;
import io.opentelemetry.sdk.metrics.data.MetricData;
import io.opentelemetry.sdk.metrics.exemplar.ExemplarFilter;
import io.opentelemetry.sdk.metrics.export.MetricExporter;
import io.opentelemetry.sdk.metrics.export.PeriodicMetricReader;
import io.opentelemetry.sdk.metrics.internal.SdkMeterProviderUtil;
import io.opentelemetry.sdk.metrics.internal.exemplar.ExemplarFilter;
import java.time.Duration;
import java.util.ArrayList;
import java.util.Collection;
Expand Down Expand Up @@ -76,7 +75,7 @@ public void setup() {
.setInterval(Duration.ofSeconds(Integer.MAX_VALUE))
.build());
// Disable exemplars
SdkMeterProviderUtil.setExemplarFilter(builder, ExemplarFilter.alwaysOff());
builder.setExemplarFilter(ExemplarFilter.alwaysOff());
sdkMeterProvider = builder.build();
histogram = sdkMeterProvider.get("meter").histogramBuilder("histogram").build();

Expand Down
5 changes: 2 additions & 3 deletions ...ava/io/opentelemetry/sdk/metrics/internal/state/InstrumentGarbageCollectionBenchmark.java
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Expand Up @@ -10,9 +10,8 @@
import io.opentelemetry.sdk.metrics.SdkMeterProvider;
import io.opentelemetry.sdk.metrics.SdkMeterProviderBuilder;
import io.opentelemetry.sdk.metrics.data.AggregationTemporality;
import io.opentelemetry.sdk.metrics.exemplar.ExemplarFilter;
import io.opentelemetry.sdk.metrics.export.PeriodicMetricReader;
import io.opentelemetry.sdk.metrics.internal.SdkMeterProviderUtil;
import io.opentelemetry.sdk.metrics.internal.exemplar.ExemplarFilter;
import io.opentelemetry.sdk.metrics.internal.state.TestInstrumentType.InstrumentTester;
import io.opentelemetry.sdk.metrics.internal.state.TestInstrumentType.TestInstrumentsState;
import java.time.Duration;
Expand Down Expand Up @@ -96,7 +95,7 @@ public void setup() {
attributesList = AttributesGenerator.generate(cardinality);

// Disable exemplars
SdkMeterProviderUtil.setExemplarFilter(builder, ExemplarFilter.alwaysOff());
builder.setExemplarFilter(ExemplarFilter.alwaysOff());

sdkMeterProvider = builder.build();
testInstrumentsState =
Expand Down
2 changes: 1 addition & 1 deletion sdk/metrics/src/main/java/io/opentelemetry/sdk/metrics/SdkMeterProvider.java
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Expand Up @@ -15,13 +15,13 @@
import io.opentelemetry.sdk.internal.ComponentRegistry;
import io.opentelemetry.sdk.internal.ScopeConfigurator;
import io.opentelemetry.sdk.metrics.data.MetricData;
import io.opentelemetry.sdk.metrics.exemplar.ExemplarFilter;
import io.opentelemetry.sdk.metrics.export.CardinalityLimitSelector;
import io.opentelemetry.sdk.metrics.export.CollectionRegistration;
import io.opentelemetry.sdk.metrics.export.MetricProducer;
import io.opentelemetry.sdk.metrics.export.MetricReader;
import io.opentelemetry.sdk.metrics.internal.MeterConfig;
import io.opentelemetry.sdk.metrics.internal.SdkMeterProviderUtil;
import io.opentelemetry.sdk.metrics.internal.exemplar.ExemplarFilter;
import io.opentelemetry.sdk.metrics.internal.export.RegisteredReader;
import io.opentelemetry.sdk.metrics.internal.state.MeterProviderSharedState;
import io.opentelemetry.sdk.metrics.internal.view.RegisteredView;
Expand Down
11 changes: 3 additions & 8 deletions sdk/metrics/src/main/java/io/opentelemetry/sdk/metrics/SdkMeterProviderBuilder.java
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Expand Up @@ -9,13 +9,13 @@
import io.opentelemetry.sdk.common.InstrumentationScopeInfo;
import io.opentelemetry.sdk.internal.ScopeConfigurator;
import io.opentelemetry.sdk.internal.ScopeConfiguratorBuilder;
import io.opentelemetry.sdk.metrics.exemplar.ExemplarFilter;
import io.opentelemetry.sdk.metrics.export.CardinalityLimitSelector;
import io.opentelemetry.sdk.metrics.export.MetricProducer;
import io.opentelemetry.sdk.metrics.export.MetricReader;
import io.opentelemetry.sdk.metrics.internal.MeterConfig;
import io.opentelemetry.sdk.metrics.internal.SdkMeterProviderUtil;
import io.opentelemetry.sdk.metrics.internal.debug.SourceInfo;
import io.opentelemetry.sdk.metrics.internal.exemplar.ExemplarFilter;
import io.opentelemetry.sdk.metrics.internal.view.RegisteredView;
import io.opentelemetry.sdk.resources.Resource;
import java.util.ArrayList;
Expand Down Expand Up @@ -80,13 +80,8 @@ public SdkMeterProviderBuilder addResource(Resource resource) {
return this;
}

/**
* Assign an {@link ExemplarFilter} for all metrics created by Meters.
*
* <p>This method is experimental so not public. You may reflectively call it using {@link
* SdkMeterProviderUtil#setExemplarFilter(SdkMeterProviderBuilder, ExemplarFilter)}.
*/
SdkMeterProviderBuilder setExemplarFilter(ExemplarFilter filter) {
/** Assign an {@link ExemplarFilter} for all metrics created by Meters. */
public SdkMeterProviderBuilder setExemplarFilter(ExemplarFilter filter) {
this.exemplarFilter = filter;
return this;
}
Expand Down
9 changes: 2 additions & 7 deletions ...cs/internal/exemplar/AlwaysOffFilter.java → ...sdk/metrics/exemplar/AlwaysOffFilter.java
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Expand Up @@ -3,17 +3,12 @@
* SPDX-License-Identifier: Apache-2.0
*/

package io.opentelemetry.sdk.metrics.internal.exemplar;
package io.opentelemetry.sdk.metrics.exemplar;

import io.opentelemetry.api.common.Attributes;
import io.opentelemetry.context.Context;

/**
* A filter which makes no measurements eligible for being an exemplar.
*
* <p>This class is internal and is hence not for public use. Its APIs are unstable and can change
* at any time.
*/
/** A filter which makes no measurements eligible for being an exemplar. */
public final class AlwaysOffFilter implements ExemplarFilter {
static final ExemplarFilter INSTANCE = new AlwaysOffFilter();

Expand Down
9 changes: 2 additions & 7 deletions ...ics/internal/exemplar/AlwaysOnFilter.java → .../sdk/metrics/exemplar/AlwaysOnFilter.java
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Expand Up @@ -3,17 +3,12 @@
* SPDX-License-Identifier: Apache-2.0
*/

package io.opentelemetry.sdk.metrics.internal.exemplar;
package io.opentelemetry.sdk.metrics.exemplar;

import io.opentelemetry.api.common.Attributes;
import io.opentelemetry.context.Context;

/**
* A filter which makes all measurements eligible for being an exemplar.
*
* <p>This class is internal and is hence not for public use. Its APIs are unstable and can change
* at any time.
*/
/** A filter which makes all measurements eligible for being an exemplar. */
public final class AlwaysOnFilter implements ExemplarFilter {
static final ExemplarFilter INSTANCE = new AlwaysOnFilter();

Expand Down
5 changes: 1 addition & 4 deletions ...ics/internal/exemplar/ExemplarFilter.java → .../sdk/metrics/exemplar/ExemplarFilter.java
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Expand Up @@ -3,17 +3,14 @@
* SPDX-License-Identifier: Apache-2.0
*/

package io.opentelemetry.sdk.metrics.internal.exemplar;
package io.opentelemetry.sdk.metrics.exemplar;

import io.opentelemetry.api.common.Attributes;
import io.opentelemetry.context.Context;

/**
* Exemplar filters are used to pre-filter measurements before attempting to store them in a
* reservoir.
*
* <p>This class is internal and is hence not for public use. Its APIs are unstable and can change
* at any time.
*/
public interface ExemplarFilter {
/** Returns whether or not a reservoir should attempt to filter a measurement. */
Expand Down
5 changes: 1 addition & 4 deletions .../internal/exemplar/ExemplarReservoir.java → ...k/metrics/exemplar/ExemplarReservoir.java
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Expand Up @@ -3,7 +3,7 @@
* SPDX-License-Identifier: Apache-2.0
*/

package io.opentelemetry.sdk.metrics.internal.exemplar;
package io.opentelemetry.sdk.metrics.exemplar;

import io.opentelemetry.api.common.Attributes;
import io.opentelemetry.context.Context;
Expand All @@ -20,9 +20,6 @@
* An interface for an exemplar reservoir of samples.
*
* <p>This represents a reservoir for a specific "point" of metric data.
*
* <p>This class is internal and is hence not for public use. Its APIs are unstable and can change
* at any time.
*/
public interface ExemplarReservoir<T extends ExemplarData> {
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Does this guy need to be part of our public API? Do we want to allow people to create their own custom reservoir implementations? Just making sure we're not opening things up a bit too much before we know this is something that we want people to be able to customize.

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Welp https://opentelemetry.io/docs/specs/otel/metrics/sdk/#custom-exemplarreservoir 🙈

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cool. thanks for checking. 👍🏽


Expand Down
2 changes: 1 addition & 1 deletion ...l/exemplar/FilteredExemplarReservoir.java → ...s/exemplar/FilteredExemplarReservoir.java
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Expand Up @@ -3,7 +3,7 @@
* SPDX-License-Identifier: Apache-2.0
*/

package io.opentelemetry.sdk.metrics.internal.exemplar;
package io.opentelemetry.sdk.metrics.exemplar;

import io.opentelemetry.api.common.Attributes;
import io.opentelemetry.context.Context;
Expand Down
2 changes: 1 addition & 1 deletion .../exemplar/FixedSizeExemplarReservoir.java → .../exemplar/FixedSizeExemplarReservoir.java
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Expand Up @@ -3,7 +3,7 @@
* SPDX-License-Identifier: Apache-2.0
*/

package io.opentelemetry.sdk.metrics.internal.exemplar;
package io.opentelemetry.sdk.metrics.exemplar;

import io.opentelemetry.api.common.Attributes;
import io.opentelemetry.context.Context;
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2 changes: 1 addition & 1 deletion .../exemplar/HistogramExemplarReservoir.java → .../exemplar/HistogramExemplarReservoir.java
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Expand Up @@ -3,7 +3,7 @@
* SPDX-License-Identifier: Apache-2.0
*/

package io.opentelemetry.sdk.metrics.internal.exemplar;
package io.opentelemetry.sdk.metrics.exemplar;

import io.opentelemetry.api.common.Attributes;
import io.opentelemetry.context.Context;
Expand Down
2 changes: 1 addition & 1 deletion ...emplar/LongToDoubleExemplarReservoir.java → ...emplar/LongToDoubleExemplarReservoir.java
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Expand Up @@ -3,7 +3,7 @@
* SPDX-License-Identifier: Apache-2.0
*/

package io.opentelemetry.sdk.metrics.internal.exemplar;
package io.opentelemetry.sdk.metrics.exemplar;

import io.opentelemetry.api.common.Attributes;
import io.opentelemetry.context.Context;
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2 changes: 1 addition & 1 deletion ...ernal/exemplar/NoopExemplarReservoir.java → ...trics/exemplar/NoopExemplarReservoir.java
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* SPDX-License-Identifier: Apache-2.0
*/

package io.opentelemetry.sdk.metrics.internal.exemplar;
package io.opentelemetry.sdk.metrics.exemplar;

import io.opentelemetry.api.common.Attributes;
import io.opentelemetry.context.Context;
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2 changes: 1 addition & 1 deletion ...lar/RandomFixedSizeExemplarReservoir.java → ...lar/RandomFixedSizeExemplarReservoir.java
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* SPDX-License-Identifier: Apache-2.0
*/

package io.opentelemetry.sdk.metrics.internal.exemplar;
package io.opentelemetry.sdk.metrics.exemplar;

import io.opentelemetry.api.common.Attributes;
import io.opentelemetry.context.Context;
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2 changes: 1 addition & 1 deletion ...rics/internal/exemplar/ReservoirCell.java → ...y/sdk/metrics/exemplar/ReservoirCell.java
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* SPDX-License-Identifier: Apache-2.0
*/

package io.opentelemetry.sdk.metrics.internal.exemplar;
package io.opentelemetry.sdk.metrics.exemplar;

import io.opentelemetry.api.common.AttributeKey;
import io.opentelemetry.api.common.Attributes;
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2 changes: 1 addition & 1 deletion ...ernal/exemplar/ReservoirCellSelector.java → ...trics/exemplar/ReservoirCellSelector.java
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* SPDX-License-Identifier: Apache-2.0
*/

package io.opentelemetry.sdk.metrics.internal.exemplar;
package io.opentelemetry.sdk.metrics.exemplar;

import io.opentelemetry.api.common.Attributes;
import io.opentelemetry.context.Context;
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