Add ability to document configuration options in metadata.yaml

docs/instrumentation-list.yaml

@@ -239,13 +239,21 @@ libraries:
       - org.apache.camel:camel-core:[2.19,3)
   cassandra:
   - name: cassandra-4.0
+    description: |
+      Instruments the Cassandra database client, providing database client spans and metrics for Cassandra queries.
     source_path: instrumentation/cassandra/cassandra-4.0
     scope:
       name: io.opentelemetry.cassandra-4.0
     target_versions:
       javaagent:
       - com.datastax.oss:java-driver-core:[4.0,4.4)
+    configurations:
+    - name: otel.instrumentation.common.db-statement-sanitizer.enabled
+      description: Enables or disables statement sanitization for database queries.
+      default: 'true'
   - name: cassandra-4.4
+    description: |
+      Instruments the Cassandra database client, providing database client spans and metrics for Cassandra queries.
     source_path: instrumentation/cassandra/cassandra-4.4
     scope:
       name: io.opentelemetry.cassandra-4.4
@@ -254,13 +262,23 @@ libraries:
       - com.datastax.oss:java-driver-core:[4.4,]
       library:
       - com.datastax.oss:java-driver-core:4.4.0
+    configurations:
+    - name: otel.instrumentation.common.db-statement-sanitizer.enabled
+      description: Enables or disables statement sanitization for database queries.
+      default: 'true'
   - name: cassandra-3.0
+    description: |
+      Instruments the Cassandra database client, providing database client spans and metrics for Cassandra queries.
     source_path: instrumentation/cassandra/cassandra-3.0
     scope:
       name: io.opentelemetry.cassandra-3.0
     target_versions:
       javaagent:
       - com.datastax.cassandra:cassandra-driver-core:[3.0,4.0)
+    configurations:
+    - name: otel.instrumentation.common.db-statement-sanitizer.enabled
+      description: Enables or disables statement sanitization for database queries.
+      default: 'true'
   clickhouse:
   - name: clickhouse-client-0.5
     description: Instruments the V1 ClickHouseClient, providing database client spans
@@ -271,6 +289,10 @@ libraries:
     target_versions:
       javaagent:
       - com.clickhouse.client:clickhouse-client:[0.5.0,)
+    configurations:
+    - name: otel.instrumentation.common.db-statement-sanitizer.enabled
+      description: Enables or disables statement sanitization for database queries.
+      default: 'true'
   couchbase:
   - name: couchbase-3.1.6
     source_path: instrumentation/couchbase/couchbase-3.1.6
@@ -382,6 +404,8 @@ libraries:
       - org.elasticsearch:elasticsearch:[5.3.0,6.0.0)
   executors:
   - name: executors
+    description: |
+      The executor instrumentation ensures that context is automatically carried across threads by wrapping common Java executors (e.g., Executor, ExecutorService, ForkJoinPool). When a task is submitted, the current context is captured and bound to the task. Then, when the task eventually runs, even if it’s on a different thread, the instrumentation reactivates that context, enabling consistent correlation across concurrent and asynchronous workflows.
     source_path: instrumentation/executors
     scope:
       name: io.opentelemetry.executors
@@ -708,13 +732,27 @@ libraries:
       - org.jboss.logmanager:jboss-logmanager:[1.1.0.GA,)
   jdbc:
   - name: jdbc
+    description: |
+      Traces JDBC operations such as statements, batches, commits, and rollbacks by injecting byte‑code into JDBC drivers and common connection‑pool proxies. Each call produces a span named after the SQL verb, enriched with standard DB client attributes (system, database, operation, sanitized statement, peer address) and error details if an exception occurs.
     disabled_by_default: true
     source_path: instrumentation/jdbc
     scope:
       name: io.opentelemetry.jdbc
     target_versions:
       javaagent:
       - Java 8+
+    configurations:
+    - name: otel.instrumentation.jdbc.statement-sanitizer.enabled
+      description: Enables or disables statement sanitization for database queries.
+        Takes precedent to otel.instrumentation.common.db-statement-sanitizer.enabled.
+      default: 'true'
+    - name: otel.instrumentation.common.db-statement-sanitizer.enabled
+      description: Enables or disables statement sanitization for database queries.
+      default: 'true'
+    - name: otel.instrumentation.common.peer-service-mapping
+      description: Used to specify a mapping from host names or IP addresses to peer
+        services.
+      default: ''
   jedis:
   - name: jedis-1.4
     source_path: instrumentation/jedis/jedis-1.4

instrumentation-docs/build.gradle.kts

@@ -8,6 +8,7 @@ otelJava {
 
 dependencies {
   implementation("org.yaml:snakeyaml:2.4")
+  implementation("com.fasterxml.jackson.dataformat:jackson-dataformat-yaml:2.18.2")
   implementation("io.opentelemetry:opentelemetry-sdk-common")
 
   testImplementation(enforcedPlatform("org.junit:junit-bom:5.12.2"))

instrumentation-docs/readme.md

@@ -67,6 +67,9 @@ public class SpringWebInstrumentationModule extends InstrumentationModule
   * List of supported versions by the module, broken down by `library` or `javaagent` support
 * scope
   * Name: The scope name of the instrumentation, `io.opentelemetry.{instrumentation name}`
+* configurations settings
+  * List of settings that are available for the instrumentation module
+  * Each setting has a name, description, and default value
 
 ## Methodology
 
@@ -81,6 +84,10 @@ As of now, the following fields are supported, all of which are optional:
 description: "Instruments..."   # Description of the instrumentation module
 disabled_by_default: true       # Defaults to `false`
 classification: internal        # instrumentation classification: library | internal | custom
+configurations:
+  - name: otel.instrumentation.common.db-statement-sanitizer.enabled
+    description: Enables or disables statement sanitization for database queries.
+    default: true
 ```
 
 ### Gradle File Derived Information

instrumentation-docs/src/main/java/io/opentelemetry/instrumentation/docs/DocGeneratorApplication.java

@@ -5,6 +5,9 @@
 
 package io.opentelemetry.instrumentation.docs;
 
+import static java.util.Locale.Category.FORMAT;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
 import io.opentelemetry.instrumentation.docs.internal.InstrumentationModule;
 import io.opentelemetry.instrumentation.docs.utils.FileManager;
 import io.opentelemetry.instrumentation.docs.utils.YamlHelper;
@@ -14,13 +17,16 @@
 import java.nio.file.Files;
 import java.nio.file.Paths;
 import java.util.List;
+import java.util.Locale;
+import java.util.TreeMap;
 import java.util.logging.Logger;
+import java.util.stream.Collectors;
 
 public class DocGeneratorApplication {
 
   private static final Logger logger = Logger.getLogger(DocGeneratorApplication.class.getName());
 
-  public static void main(String[] args) {
+  public static void main(String[] args) throws JsonProcessingException {
     FileManager fileManager = new FileManager("instrumentation/");
     List<InstrumentationModule> modules = new InstrumentationAnalyzer(fileManager).analyze();
 
@@ -35,6 +41,67 @@ public static void main(String[] args) {
     } catch (IOException e) {
       logger.severe("Error writing instrumentation list: " + e.getMessage());
     }
+
+    printStats(modules);
+  }
+
+  private static void printStats(List<InstrumentationModule> modules) {
+    List<InstrumentationModule> metadata =
+        modules.stream().filter(m -> m.getMetadata() != null).toList();
+
+    long withDescriptions =
+        metadata.stream()
+            .filter(
+                m ->
+                    m.getMetadata().getDescription() != null
+                        && !m.getMetadata().getDescription().isEmpty())
+            .count();
+
+    long withConfigurations =
+        metadata.stream().filter(m -> !m.getMetadata().getConfigurations().isEmpty()).count();
+
+    String stats =
+        String.format(
+            Locale.getDefault(FORMAT),
+            """
+            -----------------------------------
+            Analysis Summary:
+            Total Modules: %d
+            By classification:
+            %s
+            metadata.yaml contents:
+              %s
+              %s
+            """,
+            modules.size(),
+            getClassificationStats(modules),
+            getPercentage("descriptions", withDescriptions, modules.size()),
+            getPercentage("configurations", withConfigurations, modules.size()));
+
+    logger.info(stats);
+  }
+
+  private static String getClassificationStats(List<InstrumentationModule> modules) {
+    return modules.stream()
+        .collect(
+            Collectors.groupingBy(
+                m -> m.getMetadata().getClassification(), TreeMap::new, Collectors.toList()))
+        .entrySet()
+        .stream()
+        .map(
+            entry ->
+                String.format(
+                    Locale.getDefault(FORMAT), "\t%s: %d", entry.getKey(), entry.getValue().size()))
+        .collect(Collectors.joining("\n"));
+  }
+
+  private static String getPercentage(String label, long numerator, long denominator) {
+    return label
+        + ": "
+        + numerator
+        + " ("
+        + String.format(Locale.getDefault(FORMAT), "%.2f", (double) numerator / denominator * 100)
+        + "%)";
   }
 
   private DocGeneratorApplication() {}

instrumentation-docs/src/main/java/io/opentelemetry/instrumentation/docs/InstrumentationAnalyzer.java

@@ -7,6 +7,7 @@
 
 import static io.opentelemetry.instrumentation.docs.parsers.GradleParser.parseGradleFile;
 
+import com.fasterxml.jackson.core.JsonProcessingException;
 import io.opentelemetry.instrumentation.docs.internal.DependencyInfo;
 import io.opentelemetry.instrumentation.docs.internal.InstrumentationModule;
 import io.opentelemetry.instrumentation.docs.internal.InstrumentationType;
@@ -62,7 +63,7 @@ public static List<InstrumentationModule> convertToInstrumentationModules(
    *
    * @return a list of {@link InstrumentationModule}
    */
-  List<InstrumentationModule> analyze() {
+  List<InstrumentationModule> analyze() throws JsonProcessingException {
     List<InstrumentationPath> paths = fileManager.getInstrumentationPaths();
     List<InstrumentationModule> modules = convertToInstrumentationModules(paths);
 

instrumentation-docs/src/main/java/io/opentelemetry/instrumentation/docs/internal/ConfigurationOption.java

@@ -0,0 +1,15 @@
+/*
+ * Copyright The OpenTelemetry Authors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package io.opentelemetry.instrumentation.docs.internal;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+/**
+ * This class is internal and is hence not for public use. Its APIs are unstable and can change at
+ * any time.
+ */
+public record ConfigurationOption(
+    String name, String description, @JsonProperty("default") String defaultValue) {}

instrumentation-docs/src/main/java/io/opentelemetry/instrumentation/docs/internal/InstrumentationMetaData.java

@@ -5,6 +5,9 @@
 
 package io.opentelemetry.instrumentation.docs.internal;
 
+import com.fasterxml.jackson.annotation.JsonProperty;
+import java.util.Collections;
+import java.util.List;
 import java.util.Objects;
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
@@ -15,16 +18,26 @@
  */
 public class InstrumentationMetaData {
   @Nullable private String description;
-  @Nullable private Boolean disabledByDefault;
+
+  @JsonProperty("disabled_by_default")
+  @Nullable
+  private Boolean disabledByDefault;
+
   private String classification;
 
+  private List<ConfigurationOption> configurations = Collections.emptyList();
+
   public InstrumentationMetaData() {}
 
   public InstrumentationMetaData(
-      String description, String classification, Boolean disabledByDefault) {
+      String description,
+      String classification,
+      Boolean disabledByDefault,
+      List<ConfigurationOption> configurations) {
     this.classification = classification;
     this.disabledByDefault = disabledByDefault;
     this.description = description;
+    this.configurations = Objects.requireNonNullElse(configurations, Collections.emptyList());
   }
 
   @Nullable
@@ -54,4 +67,12 @@ public void setClassification(@Nullable String classification) {
   public void setDisabledByDefault(@Nullable Boolean disabledByDefault) {
     this.disabledByDefault = disabledByDefault;
   }
+
+  public List<ConfigurationOption> getConfigurations() {
+    return configurations;
+  }
+
+  public void setConfigurations(@Nullable List<ConfigurationOption> configurations) {
+    this.configurations = Objects.requireNonNullElse(configurations, Collections.emptyList());
+  }
 }

instrumentation-docs/src/main/java/io/opentelemetry/instrumentation/docs/utils/YamlHelper.java

@@ -5,6 +5,10 @@
 
 package io.opentelemetry.instrumentation.docs.utils;
 
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.dataformat.yaml.YAMLFactory;
+import io.opentelemetry.instrumentation.docs.internal.ConfigurationOption;
 import io.opentelemetry.instrumentation.docs.internal.InstrumentationClassification;
 import io.opentelemetry.instrumentation.docs.internal.InstrumentationMetaData;
 import io.opentelemetry.instrumentation.docs.internal.InstrumentationModule;
@@ -17,23 +21,13 @@
 import java.util.logging.Logger;
 import java.util.stream.Collectors;
 import org.yaml.snakeyaml.DumperOptions;
-import org.yaml.snakeyaml.TypeDescription;
 import org.yaml.snakeyaml.Yaml;
 
 public class YamlHelper {
 
   private static final Logger logger = Logger.getLogger(YamlHelper.class.getName());
 
-  private static final Yaml metaDataYaml = new Yaml();
-
-  static {
-    TypeDescription customDescriptor = new TypeDescription(InstrumentationMetaData.class);
-    customDescriptor.substituteProperty(
-        "disabled_by_default", Boolean.class, "getDisabledByDefault", "setDisabledByDefault");
-    customDescriptor.substituteProperty(
-        "classification", String.class, "getClassification", "setClassification");
-    metaDataYaml.addTypeDescription(customDescriptor);
-  }
+  private static final ObjectMapper mapper = new ObjectMapper(new YAMLFactory());
 
   public static void generateInstrumentationYaml(
       List<InstrumentationModule> list, BufferedWriter writer) {
@@ -149,6 +143,18 @@ private static Map<String, Object> baseProperties(InstrumentationModule module)
       moduleMap.put("target_versions", targetVersions);
     }
 
+    if (module.getMetadata() != null && !module.getMetadata().getConfigurations().isEmpty()) {
+      List<Map<String, String>> configurations = new ArrayList<>();
+      for (ConfigurationOption configuration : module.getMetadata().getConfigurations()) {
+        Map<String, String> conf = new LinkedHashMap<>();
+        conf.put("name", configuration.name());
+        conf.put("description", configuration.description());
+        conf.put("default", configuration.defaultValue());
+        configurations.add(conf);
+      }
+      moduleMap.put("configurations", configurations);
+    }
+
     return moduleMap;
   }
 
@@ -158,8 +164,9 @@ private static Map<String, Object> getScopeMap(InstrumentationModule module) {
     return scopeMap;
   }
 
-  public static InstrumentationMetaData metaDataParser(String input) {
-    return metaDataYaml.loadAs(input, InstrumentationMetaData.class);
+  public static InstrumentationMetaData metaDataParser(String input)
+      throws JsonProcessingException {
+    return mapper.readValue(input, InstrumentationMetaData.class);
   }
 
   private YamlHelper() {}