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feat: Introduce OpenTelemetry Metrics Recording (#2500)
Builds off #2433, based on the design in go/java-gapic-otel-metrics-design. Discovered two issues via showcase tests: 1. #2502 2. #2503 These issues are not blocking for this PR. --------- Co-authored-by: Blake Li <blakeli@google.com>
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gax-java/gax/src/main/java/com/google/api/gax/tracing/OpenTelemetryMetricsRecorder.java
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| /* | ||
| * Copyright 2024 Google LLC | ||
| * | ||
| * Redistribution and use in source and binary forms, with or without | ||
| * modification, are permitted provided that the following conditions are | ||
| * met: | ||
| * | ||
| * * Redistributions of source code must retain the above copyright | ||
| * notice, this list of conditions and the following disclaimer. | ||
| * * Redistributions in binary form must reproduce the above | ||
| * copyright notice, this list of conditions and the following disclaimer | ||
| * in the documentation and/or other materials provided with the | ||
| * distribution. | ||
| * * Neither the name of Google LLC nor the names of its | ||
| * contributors may be used to endorse or promote products derived from | ||
| * this software without specific prior written permission. | ||
| * | ||
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | ||
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | ||
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | ||
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | ||
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | ||
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | ||
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | ||
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | ||
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | ||
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | ||
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | ||
| */ | ||
|
|
||
| package com.google.api.gax.tracing; | ||
|
|
||
| import com.google.api.core.BetaApi; | ||
| import com.google.api.core.InternalApi; | ||
| import com.google.api.gax.core.GaxProperties; | ||
| import com.google.common.annotations.VisibleForTesting; | ||
| import com.google.common.base.Preconditions; | ||
| import io.opentelemetry.api.OpenTelemetry; | ||
| import io.opentelemetry.api.common.Attributes; | ||
| import io.opentelemetry.api.common.AttributesBuilder; | ||
| import io.opentelemetry.api.metrics.DoubleHistogram; | ||
| import io.opentelemetry.api.metrics.LongCounter; | ||
| import io.opentelemetry.api.metrics.Meter; | ||
| import java.util.Map; | ||
|
|
||
| /** | ||
| * OpenTelemetry implementation of recording metrics. This implementation collections the | ||
| * measurements related to the lifecyle of an RPC. | ||
| * | ||
| * <p>For the Otel implementation, an attempt is a single RPC invocation and an operation is the | ||
| * collection of all the attempts made before a response is returned (either as a success or an | ||
| * error). A single call (i.e. `EchoClient.echo()`) should have an operation_count of 1 and may have | ||
| * an attempt_count of 1+ (depending on the retry configurations). | ||
| */ | ||
| @BetaApi | ||
| @InternalApi | ||
| public class OpenTelemetryMetricsRecorder implements MetricsRecorder { | ||
| private final DoubleHistogram attemptLatencyRecorder; | ||
| private final DoubleHistogram operationLatencyRecorder; | ||
| private final LongCounter operationCountRecorder; | ||
| private final LongCounter attemptCountRecorder; | ||
|
|
||
| /** | ||
| * Creates the following instruments for the following metrics: | ||
| * | ||
| * <ul> | ||
| * <li>Attempt Latency: Histogram | ||
| * <li>Operation Latency: Histogram | ||
| * <li>Attempt Count: Counter | ||
| * <li>Operation Count: Counter | ||
| * </ul> | ||
| * | ||
| * @param openTelemetry OpenTelemetry instance | ||
| * @param serviceName Service Name | ||
| */ | ||
| public OpenTelemetryMetricsRecorder(OpenTelemetry openTelemetry, String serviceName) { | ||
| Meter meter = | ||
| openTelemetry | ||
| .meterBuilder("gax-java") | ||
| .setInstrumentationVersion(GaxProperties.getGaxVersion()) | ||
| .build(); | ||
| this.attemptLatencyRecorder = | ||
| meter | ||
| .histogramBuilder(serviceName + "/attempt_latency") | ||
| .setDescription("Time an individual attempt took") | ||
| .setUnit("ms") | ||
| .build(); | ||
| this.operationLatencyRecorder = | ||
| meter | ||
| .histogramBuilder(serviceName + "/operation_latency") | ||
| .setDescription( | ||
| "Total time until final operation success or failure, including retries and backoff.") | ||
| .setUnit("ms") | ||
| .build(); | ||
| this.attemptCountRecorder = | ||
| meter | ||
| .counterBuilder(serviceName + "/attempt_count") | ||
| .setDescription("Number of Attempts") | ||
| .setUnit("1") | ||
| .build(); | ||
| this.operationCountRecorder = | ||
| meter | ||
| .counterBuilder(serviceName + "/operation_count") | ||
| .setDescription("Number of Operations") | ||
| .setUnit("1") | ||
| .build(); | ||
| } | ||
|
|
||
| /** | ||
| * Record the latency for an individual attempt. Data is stored in a Histogram. | ||
| * | ||
| * @param attemptLatency Attempt Latency in ms | ||
| * @param attributes Map of the attributes to store | ||
| */ | ||
| @Override | ||
| public void recordAttemptLatency(double attemptLatency, Map<String, String> attributes) { | ||
| attemptLatencyRecorder.record(attemptLatency, toOtelAttributes(attributes)); | ||
| } | ||
|
|
||
| /** | ||
| * Record an attempt made. The attempt count number is stored in a LongCounter. | ||
| * | ||
| * <p>The count should be set as 1 every time this is invoked (each retry attempt) | ||
| * | ||
| * @param count The number of attempts made | ||
| * @param attributes Map of the attributes to store | ||
| */ | ||
| @Override | ||
| public void recordAttemptCount(long count, Map<String, String> attributes) { | ||
| attemptCountRecorder.add(count, toOtelAttributes(attributes)); | ||
| } | ||
|
|
||
| /** | ||
| * Record the latency for the entire operation. This is the latency for the entire RPC, including | ||
| * all the retry attempts | ||
| * | ||
| * @param operationLatency Operation Latency in ms | ||
| * @param attributes Map of the attributes to store | ||
| */ | ||
| @Override | ||
| public void recordOperationLatency(double operationLatency, Map<String, String> attributes) { | ||
| operationLatencyRecorder.record(operationLatency, toOtelAttributes(attributes)); | ||
| } | ||
|
|
||
| /** | ||
| * Record an operation made. The operation count number is stored in a LongCounter. | ||
| * | ||
| * <p>The operation count should always be 1 and this should be invoked once. | ||
| * | ||
| * @param count The number of operations made | ||
| * @param attributes Map of the attributes to store | ||
| */ | ||
| @Override | ||
| public void recordOperationCount(long count, Map<String, String> attributes) { | ||
| operationCountRecorder.add(count, toOtelAttributes(attributes)); | ||
| } | ||
|
|
||
| @VisibleForTesting | ||
| Attributes toOtelAttributes(Map<String, String> attributes) { | ||
| Preconditions.checkNotNull(attributes, "Attributes map cannot be null"); | ||
| AttributesBuilder attributesBuilder = Attributes.builder(); | ||
| attributes.forEach(attributesBuilder::put); | ||
| return attributesBuilder.build(); | ||
| } | ||
| } |
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