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/*
* Copyright 2023 Responsive Computing, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package dev.responsive.kafka.internal.metrics;
import dev.responsive.kafka.internal.metrics.exporter.MetricsExportService;
import dev.responsive.kafka.internal.metrics.exporter.NoopMetricsExporterService;
import java.io.Closeable;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.stream.Collectors;
import org.apache.kafka.common.MetricName;
import org.apache.kafka.common.TopicPartition;
import org.apache.kafka.common.metrics.KafkaMetric;
import org.apache.kafka.common.metrics.MetricValueProvider;
import org.apache.kafka.common.metrics.Metrics;
import org.apache.kafka.common.metrics.Sensor;
import org.apache.kafka.streams.processor.TaskId;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class ResponsiveMetrics implements Closeable {
private static final Logger LOG = LoggerFactory.getLogger(ResponsiveMetrics.class);
public static final String RESPONSIVE_METRICS_NAMESPACE = "dev.responsive";
public static final String AVG_SUFFIX = "-avg";
public static final String MAX_SUFFIX = "-max";
public static final String RATE_SUFFIX = "-rate";
public static final String TOTAL_SUFFIX = "-total";
public static final String AVG_DESCRIPTION = "The average ";
public static final String MAX_DESCRIPTION = "The maximum ";
public static final String RATE_DESCRIPTION = "The rate of ";
public static final String TOTAL_DESCRIPTION = "The total ";
private OrderedTagsSupplier orderedTagsSupplier;
private final MetricsExportService exportService;
private final Metrics metrics;
public ResponsiveMetrics(final Metrics metrics) {
this(metrics, new NoopMetricsExporterService());
}
public ResponsiveMetrics(final Metrics metrics, final MetricsExportService exportService) {
this.metrics = metrics;
this.exportService = exportService;
}
/**
* @param applicationId the Streams application id, ie the shared consumer group id
* @param streamsClientId the Streams client id, ie the process-specific id
* @param versionMetadata struct containing Responsive and Kafka Streams version info
* @param userTags optional custom tags that will be attached to each metric in alphabetic order
*/
public void initializeTags(
final String applicationId,
final String streamsClientId,
final ClientVersionMetadata versionMetadata,
final Map userTags
) {
orderedTagsSupplier = new OrderedTagsSupplier(
versionMetadata.responsiveClientVersion,
versionMetadata.responsiveClientCommitId,
versionMetadata.streamsClientVersion,
versionMetadata.streamsClientCommitId,
applicationId, // consumer group is technically redundant with app-id, but both are useful
applicationId,
streamsClientId,
userTags
);
}
public static class MetricScope {
private final String groupName;
private final LinkedHashMap tags;
// make this private so that users have to create one of the scopes defined below
private MetricScope(final String groupName, final LinkedHashMap tags) {
this.groupName = groupName;
this.tags = tags;
}
public String groupName() {
return groupName;
}
// Enforce LinkedHashMap to maintain tag ordering in mbean name
public LinkedHashMap tags() {
return tags;
}
public String sensorName(final String name) {
return String.join("/",
groupName(),
name,
tags().entrySet().stream()
.map(e -> e.getKey() + ":" + e.getValue()).collect(Collectors.joining(","))
);
}
public MetricScope withTags(final String key, final String val) {
final LinkedHashMap updated = new LinkedHashMap<>(tags);
if (tags.containsKey(key)) {
throw new IllegalStateException("Duplicate tag key " + key);
}
updated.put(key, val);
return new MetricScope(groupName, updated);
}
}
public MetricScope applicationLevelMetric(final String group) {
return new MetricScope(
group,
orderedTagsSupplier.applicationGroupTags()
);
}
public MetricScope processorLevelMetric(
final String group,
final String threadId,
final TaskId taskId,
final String processorName
) {
return new MetricScope(
group,
orderedTagsSupplier.processorGroupTags(threadId, taskId, processorName));
}
public MetricScope threadLevelMetric(final String group, final String threadId) {
return new MetricScope(
group,
orderedTagsSupplier.threadGroupTags(threadId));
}
public MetricScope topicLevelMetric(
final String group,
final String threadId,
final TopicPartition topicPartition
) {
return new MetricScope(
group,
orderedTagsSupplier.topicGroupTags(threadId, topicPartition)
);
}
public MetricScope storeLevelMetric(
final String group,
final String threadId,
final TopicPartition changelog,
final String storeName
) {
return new MetricScope(
group,
orderedTagsSupplier.storeGroupTags(threadId, changelog, storeName)
);
}
/**
* @param metricName a unique name for this metric
* @param metricDescription a short description of the recorded metric
* @param metricScope the {@link MetricScope} containing the corresponding group tags
*
* @return the {@link MetricName}, which should be saved so that this
* metric can be cleaned up when the associated resource is closed
*/
public MetricName metricName(
final String metricName,
final String metricDescription,
final MetricScope metricScope
) {
return new MetricName(
metricName,
metricScope.groupName(),
metricDescription,
metricScope.tags()
);
}
/**
* @param metricName a unique name for this metric
* @param metricDescription a short description of the recorded metric
* @param metricScope the {@link MetricScope} containing the corresponding group tags
* @param additionalTags a set of additional tags to be attached to the metric
*
* @return the {@link MetricName}, which should be saved so that this
* metric can be cleaned up when the associated resource is closed
*/
public MetricName metricName(
final String metricName,
final String metricDescription,
final MetricScope metricScope,
final LinkedHashMap additionalTags
) {
final LinkedHashMap allTags = new LinkedHashMap<>(metricScope.tags());
allTags.putAll(additionalTags);
return new MetricName(
metricName,
metricScope.groupName(),
metricDescription,
allTags
);
}
public void addMetric(final MetricName metricName, final MetricValueProvider valueProvider) {
metrics.addMetric(metricName, valueProvider);
}
public Sensor addSensor(final String sensorName) {
return metrics.sensor(sensorName);
}
public void removeSensor(final String sensorName) {
metrics.removeSensor(sensorName);
}
public void removeMetric(final MetricName metricName) {
metrics.removeMetric(metricName);
}
public Map metrics() {
return metrics.metrics();
}
@Override
public void close() {
if (!metrics().isEmpty()) {
LOG.warn("Not all metrics were cleaned up before close: {}", metrics().keySet());
}
metrics.close();
exportService.close();
}
}
