8000 KAFKA-18894: Add KIP-877 support for ConfigProvider by arvi18 · Pull Request #14 · coderabbit-test/kafka · GitHub
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KAFKA-18894: Add KIP-877 support for ConfigProvider #14

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KAFKA-18894: Add KIP-877 support for ConfigProvider #14

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563f347
KAFKA-18894: Add KIP-877 support for ConfigProvider
Yunyung Apr 7, 2025
08dff59
spotlessApply
Yunyung Apr 7, 2025
9e221e3
Update msg in Utils.closeQuietly
Yunyung Apr 7, 2025
1dd8f41
Add a test to verify withPluginMetrics is called after configure
Yunyung Apr 7, 2025
204c8a9
Refactor the test
Yunyung Apr 7, 2025
96fd5a6
Refactor
Yunyung Apr 7, 2025
6ef4001
Add a newline at the end of the file
Yunyung Apr 7, 2025
44ecfdb
Fix NPE in transform method
Yunyung Apr 8, 2025
e26a06f
Remove debug print
Yunyung Apr 8, 2025
27d9a55
Merge branch 'trunk' into KAFKA-18894
Yunyung Apr 12, 2025
b92a2bb
Address m1a2st comments
Yunyung Apr 12, 2025
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18 changes: 10 additions & 8 deletions clients/src/main/java/org/apache/kafka/common/config/AbstractConfig.java
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Expand Up @@ -20,6 +20,7 @@
import org.apache.kafka.common.KafkaException;
import org.apache.kafka.common.config.provider.ConfigProvider;
import org.apache.kafka.common.config.types.Password;
import org.apache.kafka.common.internals.Plugin;
import org.apache.kafka.common.utils.Utils;

import org.slf4j.Logger;
Expand Down Expand Up @@ -546,16 +547,16 @@ private Map<String, String> extractPotentialVariables(Map<?, ?> configMap) {
configProperties = configProviderProps;
classNameFilter = ignored -> true;
}
Map<String, ConfigProvider> providers = instantiateConfigProviders(providerConfigString, configProperties, classNameFilter);
Map<String, Plugin<ConfigProvider>> providerPlugins = instantiateConfigProviders(providerConfigString, configProperties, classNameFilter);

if (!providers.isEmpty()) {
ConfigTransformer configTransformer = new ConfigTransformer(providers);
if (!providerPlugins.isEmpty()) {
ConfigTransformer configTransformer = new ConfigTransformer(providerPlugins);
ConfigTransformerResult result = configTransformer.transform(indirectVariables);
if (!result.data().isEmpty()) {
resolvedOriginals.putAll(result.data());
}
}
providers.values().forEach(x -> Utils.closeQuietly(x, "config provider"));
providerPlugins.values().forEach(x -> Utils.closeQuietly(x, "config provider plugin"));

return new ResolvingMap<>(resolvedOriginals, originals);
}
Expand Down Expand Up @@ -594,7 +595,7 @@ private Map<String, Object> configProviderProperties(String configProviderPrefix
* @param classNameFilter Filter for config provider class names
* @return map of config provider name and its instance.
*/
private Map<String, ConfigProvider> instantiateConfigProviders(
private Map<String, Plugin<ConfigProvider>> instantiateConfigProviders(
Map<String, String> indirectConfigs,
Map<String, ?> providerConfigProperties,
Predicate<String> classNameFilter
Expand All @@ -620,21 +621,22 @@ private Map<String, ConfigProvider> instantiateConfigProviders(
}
}
// Instantiate Config Providers
Map<String, ConfigProvider> configProviderInstances = new HashMap<>();
Map<String, Plugin<ConfigProvider>> configProviderPluginInstances = new HashMap<>();
for (Map.Entry<String, String> entry : providerMap.entrySet()) {
try {
String prefix = CONFIG_PROVIDERS_CONFIG + "." + entry.getKey() + CONFIG_PROVIDERS_PARAM;
Map<String, ?> configProperties = configProviderProperties(prefix, providerConfigProperties);
ConfigProvider provider = Utils.newInstance(entry.getValue(), ConfigProvider.class);
provider.configure(configProperties);
configProviderInstances.put(entry.getKey(), provider);
Plugin<ConfigProvider> providerPlugin = Plugin.wrapInstance(provider, null, CONFIG_PROVIDERS_CONFIG);
configProviderPluginInstances.put(entry.getKey(), providerPlugin);
} catch (ClassNotFoundException e) {
log.error("Could not load config provider class {}", entry.getValue(), e);
throw new ConfigException(providerClassProperty(entry.getKey()), entry.getValue(), "Could not load config provider class or one of its dependencies");
}
}

return configProviderInstances;
return configProviderPluginInstances;
}

private static String providerClassProperty(String providerName) {
Expand Down
15 changes: 8 additions & 7 deletions clients/src/main/java/org/apache/kafka/common/config/ConfigTransformer.java
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Expand Up @@ -18,6 +18,7 @@

import org.apache.kafka.common.config.provider.ConfigProvider;
import org.apache.kafka.common.config.provider.FileConfigProvider;
import org.apache.kafka.common.internals.Plugin;

import java.util.ArrayList;
import java.util.HashMap;
Expand Down Expand Up @@ -56,15 +57,15 @@ public class ConfigTransformer {
public static final Pattern DEFAULT_PATTERN = Pattern.compile("\\$\\{([^}]*?):(([^}]*?):)?([^}]*?)\\}");
private static final String EMPTY_PATH = "";

private final Map<String, ConfigProvider> configProviders;
private final Map<String, Plugin<ConfigProvider>> configProviderPlugins;

/**
* Creates a ConfigTransformer with the default pattern, of the form <code>${provider:[path:]key}</code>.
*
* @param configProviders a Map of provider names and {@link ConfigProvider} instances.
* @param configProviderPlugins a Map of provider names and {@link ConfigProvider} instances.
*/
public ConfigTransformer(Map<String, ConfigProvider> configProviders) {
this.configProviders = configProviders;
public ConfigTransformer(Map<String, Plugin<ConfigProvider>> configProviderPlugins) {
this.configProviderPlugins = configProviderPlugins;
}

/**
Expand Down Expand Up @@ -94,13 +95,13 @@ public ConfigTransformerResult transform(Map<String, String> configs) {
Map<String, Long> ttls = new HashMap<>();
for (Map.Entry<String, Map<String, Set<String>>> entry : keysByProvider.entrySet()) {
String providerName = entry.getKey();
ConfigProvider provider = configProviders.get(providerName);
Plugin<ConfigProvider> providerPlugin = configProviderPlugins.get(providerName);
Map<String, Set<String>> keysByPath = entry.getValue();
if (provider != null && keysByPath != null) {
if (providerPlugin != null && keysByPath != null) {
for (Map.Entry<String, Set<String>> pathWithKeys : keysByPath.entrySet()) {
String path = pathWithKeys.getKey();
Set<String> keys = new HashSet<>(pathWithKeys.getValue());
ConfigData configData = provider.get(path, keys);
ConfigData configData = providerPlugin.get().get(path, keys);
Map<String, String> data = configData.data();
Long ttl = configData.ttl();
if (ttl != null && ttl >= 0) {
Expand Down
4 changes: 4 additions & 0 deletions clients/src/main/java/org/apache/kafka/common/config/provider/ConfigProvider.java
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Expand Up @@ -29,6 +29,10 @@
* <p>Kafka Connect discovers implementations of this interface using the Java {@link java.util.ServiceLoader} mechanism.
* To support this, implementations of this interface should also contain a service provider configuration file in
* {@code META-INF/services/org.apache.kafka.common.config.provider.ConfigProvider}.
* <p>Implement {@link org.apache.kafka.common.metrics.Monitorable} to enable the config provider to register metrics.
* The following tags are automatically added to all metrics registered: <code>config</code> set to
* <code>config.providers</code>, <code>class</code> set to the ConfigProvider class name,
* and <code>provider</code> set to the provider name.
*/
public interface ConfigProvider extends Configurable, Closeable {

Expand Down
17 changes: 9 additions & 8 deletions clients/src/test/java/org/apache/kafka/common/config/ConfigTransformerTest.java
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Expand Up @@ -17,6 +17,7 @@
package org.apache.kafka.common.config;

import org.apache.kafka.common.config.provider.ConfigProvider;
import org.apache.kafka.common.internals.Plugin;

import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
Expand Down Expand Up @@ -45,12 +46,12 @@ public class ConfigTransformerTest {

@BeforeEach
public void setup() {
configTransformer = new ConfigTransformer(Collections.singletonMap("test", new TestConfigProvider()));
configTransformer = new ConfigTransformer(Map.of("test", Plugin.wrapInstance(new TestConfigProvider(), null, "config.providers")));
}

@Test
public void testReplaceVariable() {
ConfigTransformerResult result = configTransformer.transform(Collections.singletonMap(MY_KEY, "${test:testPath:testKey}"));
ConfigTransformerResult result = configTransformer.transform(Map.of(MY_KEY, "${test:testPath:testKey}"));
Map<String, String> data = result.data();
Map<String, Long> ttls = result.ttls();
assertEquals(TEST_RESULT, data.get(MY_KEY));
Expand All @@ -59,7 +60,7 @@ public void testReplaceVariable() {

@Test
public void testReplaceVariableWithTTL() {
ConfigTransformerResult result = configTransformer.transform(Collections.singletonMap(MY_KEY, "${test:testPath:testKeyWithTTL}"));
ConfigTransformerResult result = configTransformer.transform(Map.of(MY_KEY, "${test:testPath:testKeyWithTTL}"));
Map<String, String> data = result.data();
Map<String, Long> ttls = result.ttls();
assertEquals(TEST_RESULT_WITH_TTL, data.get(MY_KEY));
Expand All @@ -68,28 +69,28 @@ public void testReplaceVariableWithTTL() {

@Test
public void testReplaceMultipleVariablesInValue() {
ConfigTransformerResult result = configTransformer.transform(Collections.singletonMap(MY_KEY, "hello, ${test:testPath:testKey}; goodbye, ${test:testPath:testKeyWithTTL}!!!"));
ConfigTransformerResult result = configTransformer.transform(Map.of(MY_KEY, "hello, ${test:testPath:testKey}; goodbye, ${test:testPath:testKeyWithTTL}!!!"));
Map<String, String> data = result.data();
assertEquals("hello, testResult; goodbye, testResultWithTTL!!!", data.get(MY_KEY));
}

@Test
public void testNoReplacement() {
ConfigTransformerResult result = configTransformer.transform(Collections.singletonMap(MY_KEY, "${test:testPath:missingKey}"));
ConfigTransformerResult result = configTransformer.transform(Map.of(MY_KEY, "${test:testPath:missingKey}"));
Map<String, String> data = result.data();
assertEquals("${test:testPath:missingKey}", data.get(MY_KEY));
}

@Test
public void testSingleLevelOfIndirection() {
ConfigTransformerResult result = configTransformer.transform(Collections.singletonMap(MY_KEY, "${test:testPath:testIndirection}"));
ConfigTransformerResult result = configTransformer.transform(Map.of(MY_KEY, "${test:testPath:testIndirection}"));
Map<String, String> data = result.data();
assertEquals("${test:testPath:testResult}", data.get(MY_KEY));
}

@Test
public void testReplaceVariableNoPath() {
ConfigTransformerResult result = configTransformer.transform(Collections.singletonMap(MY_KEY, "${test:testKey}"));
ConfigTransformerResult result = configTransformer.transform(Map.of(MY_KEY, "${test:testKey}"));
Map<String, String> data = result.data();
Map<String, Long> ttls = result.ttls();
assertEquals(TEST_RESULT_NO_PATH, data.get(MY_KEY));
Expand All @@ -98,7 +99,7 @@ public void testReplaceVariableNoPath() {

@Test
public void testReplaceMultipleVariablesWithoutPathInValue() {
ConfigTransformerResult result = configTransformer.transform(Collections.singletonMap(MY_KEY, "first ${test:testKey}; second ${test:testKey}"));
ConfigTransformerResult result = configTransformer.transform(Map.of(MY_KEY, "first ${test:testKey}; second ${test:testKey}"));
Map<String, String> data = result.data();
assertEquals("first testResultNoPath; second testResultNoPath", data.get(MY_KEY));
}
Expand Down
58 changes: 58 additions & 0 deletions clients/src/test/java/org/apache/kafka/common/config/provider/MonitorableConfigProvider.java
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10000
Original file line number Diff line number Diff line change
@@ -0,0 +1,58 @@
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.kafka.common.config.provider;

import org.apache.kafka.common.MetricName;
import org.apache.kafka.common.config.ConfigData;
import org.apache.kafka.common.metrics.Measurable;
import org.apache.kafka.common.metrics.Monitorable;
import org.apache.kafka.common.metrics.PluginMetrics;

import java.io.IOException;
import java.util.Map;
import java.util.Set;

public class MonitorableConfigProvider implements ConfigProvider, Monitorable {
public static final String NAME = "name";
public static final String DESCRIPTION = "description";
protected boolean configured = false;

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Security Issue: The MonitorableConfigProvider implementation adds metrics without validating the metrics source. Even in test code, this could serve as a template for real implementations. Consider adding validation to ensure metrics are from a trusted source before adding them:

@Override
public void withPluginMetrics(PluginMetrics metrics) {
  // Validate metrics source before adding metrics
  if (metrics != null && metrics.getClass().getName().startsWith("org.apache.kafka")) {
    MetricName metricName = metrics.metricName(NAME, DESCRIPTION, Map.of());
    metrics.addMetric(metricName, (Measurable) (config, now) -> 123);
  }
}

@Override
public void withPluginMetrics(PluginMetrics metrics) {
MetricName metricName = metrics.metricName(NAME, DESCRIPTION, Map.of());
metrics.addMetric(metricName, (Measurable) (config, now) -> 123);
}

@Override
public ConfigData get(String path) {
return null;
}

@Override
public ConfigData get(String path, Set<String> keys) {
return null;
}

@Override
public void close() throws IOException {
}

@Override
public void configure(Map<String, ?> configs) {
configured = true;
}
}
16 changes: 9 additions & 7 deletions connect/mirror/src/main/java/org/apache/kafka/connect/mirror/MirrorMakerConfig.java
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Expand Up @@ -23,6 +23,7 @@
import org.apache.kafka.common.config.ConfigDef.Type;
import org.apache.kafka.common.config.ConfigTransformer;
import org.apache.kafka.common.config.provider.ConfigProvider;
import org.apache.kafka.common.internals.Plugin;
import org.apache.kafka.common.security.auth.SecurityProtocol;
import org.apache.kafka.common.utils.Utils;
import org.apache.kafka.connect.runtime.WorkerConfig;
Expand Down Expand Up @@ -269,18 +270,19 @@ List<String> configProviders() {
Map<String, String> transform(Map<String, String> props) {
// transform worker config according to config.providers
List<String> providerNames = configProviders();
Map<String, ConfigProvider> providers = new HashMap<>();
Map<String, Plugin<ConfigProvider>> providerPlugins = new HashMap<>();
for (String name : providerNames) {
ConfigProvider configProvider = plugins.newConfigProvider(
Plugin<ConfigProvider> configProviderPlugin = plugins.newConfigProvider(
this,
CONFIG_PROVIDERS_CONFIG + "." + name,
Plugins.ClassLoaderUsage.PLUGINS
name,
Plugins.ClassLoaderUsage.PLUGINS,
null
);
providers.put(name, configProvider);
providerPlugins.put(name, configProviderPlugin);
}
ConfigTransformer transformer = new ConfigTransformer(providers);
ConfigTransformer transformer = new ConfigTransformer(providerPlugins);
Map<String, String> transformed = transformer.transform(props).data();
providers.values().forEach(x -> Utils.closeQuietly(x, "config provider"));
providerPlugins.values().forEach(x -> Utils.closeQuietly(x, "config provider plugin"));
return transformed;
}

Expand Down
15 changes: 8 additions & 7 deletions connect/runtime/src/main/java/org/apache/kafka/connect/runtime/Worker.java
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Expand Up @@ -209,16 +209,17 @@ public Worker(

private WorkerConfigTransformer initConfigTransformer() {
final List<String> providerNames = config.getList(WorkerConfig.CONFIG_PROVIDERS_CONFIG);
Map<String, ConfigProvider> providerMap = new HashMap<>();
Map<String, Plugin<ConfigProvider>> providerPluginMap = new HashMap<>();
for (String providerName : providerNames) {
ConfigProvider configProvider = plugins.newConfigProvider(
config,
WorkerConfig.CONFIG_PROVIDERS_CONFIG + "." + providerName,
ClassLoaderUsage.PLUGINS
Plugin<ConfigProvider> configProviderPlugin = plugins.newConfigProvider(
config,
providerName,
ClassLoaderUsage.PLUGINS,
metrics.metrics()
);
providerMap.put(providerName, configProvider);
providerPluginMap.put(providerName, configProviderPlugin);
}
return new WorkerConfigTransformer(this, providerMap);
return new WorkerConfigTransformer(this, providerPluginMap);
}
Comment on lines 210 to 223
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🛠️ Refactor suggestion

Guard against resource leaks when provider instantiation fails

plugins.newConfigProvider(...) may throw (e.g. bad class‑name, constructor error).
If that happens after a few providers are already created, those plugin instances stay open because initConfigTransformer() aborts before workerConfigTransformer is constructed and the close() call that normally releases them is never reached.

Consider wrapping the loop in a try/catch that closes any already‑created plugins before re‑throwing, e.g.:

Map<String, Plugin<ConfigProvider>> providerPluginMap = new HashMap<>();
try {
    for (String providerName : providerNames) {
        Plugin<ConfigProvider> configProviderPlugin = plugins.newConfigProvider(
            config, providerName, ClassLoaderUsage.PLUGINS, metrics.metrics());
        providerPluginMap.put(providerName, configProviderPlugin);
    }
} catch (Throwable t) {
+   providerPluginMap.values().forEach(p -> Utils.closeQuietly(p, "config provider plugin"));
    throw t;
}
return new WorkerConfigTransformer(this, Collections.unmodifiableMap(providerPluginMap));

This keeps the constructor exception‑safe and prevents dangling threads/metrics.

📝 Committable suggestion

‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

Suggested change
private WorkerConfigTransformer initConfigTransformer() {
final List<String> providerNames = config.getList(WorkerConfig.CONFIG_PROVIDERS_CONFIG);
Map<String, ConfigProvider> providerMap = new HashMap<>();
Map<String, Plugin<ConfigProvider>> providerPluginMap = new HashMap<>();
for (String providerName : providerNames) {
ConfigProvider configProvider = plugins.newConfigProvider(
config,
WorkerConfig.CONFIG_PROVIDERS_CONFIG + "." + providerName,
ClassLoaderUsage.PLUGINS
Plugin<ConfigProvider> configProviderPlugin = plugins.newConfigProvider(
config,
providerName,
ClassLoaderUsage.PLUGINS,
metrics.metrics()
);
providerMap.put(providerName, configProvider);
providerPluginMap.put(providerName, configProviderPlugin);
}
return new WorkerConfigTransformer(this, providerMap);
return new WorkerConfigTransformer(this, providerPluginMap);
}
private WorkerConfigTransformer initConfigTransformer() {
final List<String> providerNames = config.getList(WorkerConfig.CONFIG_PROVIDERS_CONFIG);
Map<String, Plugin<ConfigProvider>> providerPluginMap = new HashMap<>();
try {
for (String providerName : providerNames) {
Plugin<ConfigProvider> configProviderPlugin = plugins.newConfigProvider(
config,
providerName,
ClassLoaderUsage.PLUGINS,
metrics.metrics()
);
providerPluginMap.put(providerName, configProviderPlugin);
}
} catch (Throwable t) {
providerPluginMap.values().forEach(p ->
Utils.closeQuietly(p, "config provider plugin"));
throw t;
}
return new WorkerConfigTransformer(
this,
Collections.unmodifiableMap(providerPluginMap)
);
}


public WorkerConfigTransformer configTransformer() {
Expand Down
11 changes: 6 additions & 5 deletions connect/runtime/src/main/java/org/apache/kafka/connect/runtime/WorkerConfigTransformer.java
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Expand Up @@ -20,6 +20,7 @@
import org.apache.kafka.common.config.ConfigTransformer;
import org.apache.kafka.common.config.ConfigTransformerResult;
import org.apache.kafka.common.config.provider.ConfigProvider;
import org.apache.kafka.common.internals.Plugin;
import org.apache.kafka.common.utils.Utils;
import org.apache.kafka.connect.runtime.Herder.ConfigReloadAction;
import org.apache.kafka.connect.util.Callback;
Expand All @@ -42,12 +43,12 @@ public class WorkerConfigTransformer implements AutoCloseable {
private final Worker worker;
private final ConfigTransformer configTransformer;
private final ConcurrentMap<String, Map<String, HerderRequest>> requests = new ConcurrentHashMap<>();
private final Map<String, ConfigProvider> configProviders;
private final Map<String, Plugin<ConfigProvider>> configProviderPlugins;

public WorkerConfigTransformer(Worker worker, Map<String, ConfigProvider> configProviders) {
public WorkerConfigTransformer(Worker worker, Map<String, Plugin<ConfigProvider>> configProviderPlugins) {
this.worker = worker;
this.configProviders = configProviders;
this.configTransformer = new ConfigTransformer(configProviders);
this.configProviderPlugins = configProviderPlugins;
this.configTransformer = new ConfigTransformer(configProviderPlugins);
}

public Map<String, String> transform(Map<String, String> configs) {
Expand Down Expand Up @@ -97,6 +98,6 @@ private void scheduleReload(String connectorName, String path, long ttl) {

@Override
public void close() {
configProviders.values().forEach(x -> Utils.closeQuietly(x, "config provider"));
configProviderPlugins.values().forEach(x -> Utils.closeQuietly(x, "config provider plugin"));
}
}
7 changes: 5 additions & 2 deletions connect/runtime/src/main/java/org/apache/kafka/connect/runtime/isolation/Plugins.java
C15D
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Expand Up @@ -19,6 +19,8 @@
import org.apache.kafka.common.Configurable;
import org.apache.kafka.common.config.AbstractConfig;
import org.apache.kafka.common.config.provider.ConfigProvider;
import org.apache.kafka.common.internals.Plugin;
import org.apache.kafka.common.metrics.Metrics;
import org.apache.kafka.common.utils.Utils;
import org.apache.kafka.connect.components.Versioned;
import org.apache.kafka.connect.connector.Connector;
Expand Down Expand Up @@ -627,7 +629,8 @@ private <U> U newVersionedPlugin(
return plugin;
}

public ConfigProvider newConfigProvider(AbstractConfig config, String providerPrefix, ClassLoaderUsage classLoaderUsage) {
public Plugin<ConfigProvider> newConfigProvider(AbstractConfig config, String providerName, ClassLoaderUsage classLoaderUsage, Metrics metrics) {
String providerPrefix = WorkerConfig.CONFIG_PROVIDERS_CONFIG + "." + providerName;
String classPropertyName = providerPrefix + ".class";
Map<String, String> originalConfig = config.originalsStrings();
if (!originalConfig.containsKey(classPropertyName)) {
Expand All @@ -643,7 +646,7 @@ public ConfigProvider newConfigProvider(AbstractConfig config, String providerPr
try (LoaderSwap loaderSwap = safeLoaderSwapper().apply(plugin.getClass().getClassLoader())) {
plugin.configure(configProviderConfig);
}
return plugin;
return Plugin.wrapInstance(plugin, metrics, WorkerConfig.CONFIG_PROVIDERS_CONFIG, Map.of("provider", providerName));
}

/**
Expand Down
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