Remove scope info, always add scope labels

exporters/prometheus/src/main/java/io/opentelemetry/exporter/prometheus/Otel2PrometheusConverter.java

@@ -56,11 +56,9 @@
 import java.util.Collection;
 import java.util.Collections;
 import java.util.HashMap;
-import java.util.LinkedHashSet;
 import java.util.List;
 import java.util.Locale;
 import java.util.Map;
-import java.util.Set;
 import java.util.StringJoiner;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.TimeUnit;
@@ -82,7 +80,6 @@ final class Otel2PrometheusConverter {
   private static final long NANOS_PER_MILLISECOND = TimeUnit.MILLISECONDS.toNanos(1);
   static final int MAX_CACHE_SIZE = 10;
 
-  private final boolean otelScopeEnabled;
   @Nullable private final Predicate<String> allowedResourceAttributesFilter;
 
   /**
@@ -94,14 +91,10 @@ final class Otel2PrometheusConverter {
   /**
    * Constructor with feature flag parameter.
    *
-   * @param otelScopeEnabled enable generation of the OpenTelemetry instrumentation scope info
-   *     metric and labels.
    * @param allowedResourceAttributesFilter if not {@code null}, resource attributes with keys
    *     matching this predicate will be added as labels on each exported metric
    */
-  Otel2PrometheusConverter(
-      boolean otelScopeEnabled, @Nullable Predicate<String> allowedResourceAttributesFilter) {
-    this.otelScopeEnabled = otelScopeEnabled;
+  Otel2PrometheusConverter(@Nullable Predicate<String> allowedResourceAttributesFilter) {
     this.allowedResourceAttributesFilter = allowedResourceAttributesFilter;
     this.resourceAttributesToAllowedKeysCache =
         allowedResourceAttributesFilter != null
@@ -115,7 +108,6 @@ MetricSnapshots convert(@Nullable Collection<MetricData> metricDataCollection) {
     }
     Map<String, MetricSnapshot> snapshotsByName = new HashMap<>(metricDataCollection.size());
     Resource resource = null;
-    Set<InstrumentationScopeInfo> scopes = new LinkedHashSet<>();
     for (MetricData metricData : metricDataCollection) {
       MetricSnapshot snapshot = convert(metricData);
       if (snapshot == null) {
@@ -125,16 +117,10 @@ MetricSnapshots convert(@Nullable Collection<MetricData> metricDataCollection) {
       if (resource == null) {
         resource = metricData.getResource();
       }
-      if (otelScopeEnabled && !metricData.getInstrumentationScopeInfo().getAttributes().isEmpty()) {
-        scopes.add(metricData.getInstrumentationScopeInfo());
-      }
     }
     if (resource != null) {
       putOrMerge(snapshotsByName, makeTargetInfo(resource));
     }
-    if (otelScopeEnabled && !scopes.isEmpty()) {
-      putOrMerge(snapshotsByName, makeScopeInfo(scopes));
-    }
     return new MetricSnapshots(snapshotsByName.values());
   }
 
@@ -440,25 +426,11 @@ private InfoSnapshot makeTargetInfo(Resource resource) {
                     resource.getAttributes()))));
   }
 
-  private InfoSnapshot makeScopeInfo(Set<InstrumentationScopeInfo> scopes) {
-    List<InfoDataPointSnapshot> prometheusScopeInfos = new ArrayList<>(scopes.size());
-    for (InstrumentationScopeInfo scope : scopes) {
-      prometheusScopeInfos.add(
-          new InfoDataPointSnapshot(
-              convertAttributes(
-                  null, // resource attributes are only copied for point's attributes
-                  scope,
-                  scope.getAttributes())));
-    }
-    return new InfoSnapshot(new MetricMetadata("otel_scope"), prometheusScopeInfos);
-  }
-
   /**
    * Convert OpenTelemetry attributes to Prometheus labels.
    *
    * @param resource optional resource (attributes) to be converted.
-   * @param scope will be converted to {@code otel_scope_*} labels if {@code otelScopeEnabled} is
-   *     {@code true}.
+   * @param scope will be converted to {@code otel_scope_*} labels.
    * @param attributes the attributes to be converted.
    * @param additionalAttributes optional list of key/value pairs, may be empty.
    */
@@ -485,7 +457,7 @@ private Labels convertAttributes(
           requireNonNull(additionalAttributes[i]), additionalAttributes[i + 1]);
     }
 
-    if (otelScopeEnabled && scope != null) {
+    if (scope != null) {
       labelNameToValue.putIfAbsent(OTEL_SCOPE_NAME, scope.getName());
       if (scope.getVersion() != null) {
         labelNameToValue.putIfAbsent(OTEL_SCOPE_VERSION, scope.getVersion());

exporters/prometheus/src/main/java/io/opentelemetry/exporter/prometheus/PrometheusHttpServer.java

@@ -42,7 +42,6 @@ public final class PrometheusHttpServer implements MetricReader {
 
   private final String host;
   private final int port;
-  private final boolean otelScopeEnabled;
   @Nullable private final Predicate<String> allowedResourceAttributesFilter;
   private final MemoryMode memoryMode;
   private final DefaultAggregationSelector defaultAggregationSelector;
@@ -72,21 +71,18 @@ public static PrometheusHttpServerBuilder builder() {
       int port,
       @Nullable ExecutorService executor,
       PrometheusRegistry prometheusRegistry,
-      boolean otelScopeEnabled,
       @Nullable Predicate<String> allowedResourceAttributesFilter,
       MemoryMode memoryMode,
       @Nullable HttpHandler defaultHandler,
       DefaultAggregationSelector defaultAggregationSelector,
       @Nullable Authenticator authenticator) {
     this.host = host;
     this.port = port;
-    this.otelScopeEnabled = otelScopeEnabled;
     this.allowedResourceAttributesFilter = allowedResourceAttributesFilter;
     this.memoryMode = memoryMode;
     this.defaultAggregationSelector = defaultAggregationSelector;
     this.builder = builder;
-    this.prometheusMetricReader =
-        new PrometheusMetricReader(otelScopeEnabled, allowedResourceAttributesFilter);
+    this.prometheusMetricReader = new PrometheusMetricReader(allowedResourceAttributesFilter);
     this.prometheusRegistry = prometheusRegistry;
     prometheusRegistry.register(prometheusMetricReader);
     // When memory mode is REUSABLE_DATA, concurrent reads lead to data corruption. To prevent this,
@@ -171,7 +167,6 @@ public String toString() {
     StringJoiner joiner = new StringJoiner(",", "PrometheusHttpServer{", "}");
     joiner.add("host=" + host);
     joiner.add("port=" + port);
-    joiner.add("otelScopeEnabled=" + otelScopeEnabled);
     joiner.add("allowedResourceAttributesFilter=" + allowedResourceAttributesFilter);
     joiner.add("memoryMode=" + memoryMode);
     joiner.add(

exporters/prometheus/src/main/java/io/opentelemetry/exporter/prometheus/PrometheusHttpServerBuilder.java

@@ -30,7 +30,6 @@ public final class PrometheusHttpServerBuilder {
   private String host = DEFAULT_HOST;
   private int port = DEFAULT_PORT;
   private PrometheusRegistry prometheusRegistry = new PrometheusRegistry();
-  private boolean otelScopeEnabled = true;
   @Nullable private Predicate<String> allowedResourceAttributesFilter;
   @Nullable private ExecutorService executor;
   private MemoryMode memoryMode = DEFAULT_MEMORY_MODE;
@@ -45,7 +44,6 @@ public final class PrometheusHttpServerBuilder {
     this.host = builder.host;
     this.port = builder.port;
     this.prometheusRegistry = builder.prometheusRegistry;
-    this.otelScopeEnabled = builder.otelScopeEnabled;
     this.allowedResourceAttributesFilter = builder.allowedResourceAttributesFilter;
     this.executor = builder.executor;
     this.memoryMode = builder.memoryMode;
@@ -83,10 +81,14 @@ public PrometheusHttpServerBuilder setPrometheusRegistry(PrometheusRegistry prom
     return this;
   }
 
-  /** Set if the {@code otel_scope_*} attributes are generated. Default is {@code true}. */
+  /**
+   * Set if the {@code otel_scope_*} attributes are generated. Default is {@code true}.
+   *
+   * @deprecated {@code otel_scope_*} attributes are always generated.
+   */
   @SuppressWarnings("UnusedReturnValue")
+  @Deprecated
   public PrometheusHttpServerBuilder setOtelScopeEnabled(boolean otelScopeEnabled) {
-    this.otelScopeEnabled = otelScopeEnabled;
     return this;
   }
 
@@ -176,7 +178,6 @@ public PrometheusHttpServer build() {
         port,
         executor,
         prometheusRegistry,
-        otelScopeEnabled,
         allowedResourceAttributesFilter,
         memoryMode,
         defaultHandler,

exporters/prometheus/src/main/java/io/opentelemetry/exporter/prometheus/PrometheusMetricReader.java

@@ -28,12 +28,21 @@ public class PrometheusMetricReader implements MetricReader, MultiCollector {
   private volatile CollectionRegistration collectionRegistration = CollectionRegistration.noop();
   private final Otel2PrometheusConverter converter;
 
-  // TODO: refactor to public static create or builder pattern to align with project style
-  /** See {@link Otel2PrometheusConverter#Otel2PrometheusConverter(boolean, Predicate)}. */
+  /**
+   * Deprecated. Use {@link #PrometheusMetricReader(Predicate)}.
+   *
+   * @deprecated use {@link #PrometheusMetricReader(Predicate)}.
+   */
+  @Deprecated
+  @SuppressWarnings({"unused", "InconsistentOverloads"})
   public PrometheusMetricReader(
       boolean otelScopeEnabled, @Nullable Predicate<String> allowedResourceAttributesFilter) {
-    this.converter =
-        new Otel2PrometheusConverter(otelScopeEnabled, allowedResourceAttributesFilter);
+    this.converter = new Otel2PrometheusConverter(allowedResourceAttributesFilter);
+  }
+
+  // TODO: refactor to public static create or builder pattern to align with project style
+  public PrometheusMetricReader(@Nullable Predicate<String> allowedResourceAttributesFilter) {
+    this.converter = new Otel2PrometheusConverter(allowedResourceAttributesFilter);
   }
 
   @Override

exporters/prometheus/src/main/java/io/opentelemetry/exporter/prometheus/internal/PrometheusComponentProvider.java

@@ -45,11 +45,6 @@ public MetricReader create(DeclarativeConfigProperties config) {
       prometheusBuilder.setHost(host);
     }
 
-    Boolean withoutScopeInfo = config.getBoolean("without_scope_info");
-    if (withoutScopeInfo != null) {
-      prometheusBuilder.setOtelScopeEnabled(!withoutScopeInfo);
-    }
-
     DeclarativeConfigProperties withResourceConstantLabels =
         config.getStructured("with_resource_constant_labels");
     if (withResourceConstantLabels != null) {

exporters/prometheus/src/test/java/io/opentelemetry/exporter/prometheus/Otel2PrometheusConverterTest.java

@@ -71,7 +71,7 @@ class Otel2PrometheusConverterTest {
   private static final ObjectMapper OBJECT_MAPPER = new ObjectMapper();
 
   private final Otel2PrometheusConverter converter =
-      new Otel2PrometheusConverter(true, /* allowedResourceAttributesFilter= */ null);
+      new Otel2PrometheusConverter(/* allowedResourceAttributesFilter= */ null);
 
   @ParameterizedTest
   @MethodSource("metricMetadataArgs")
@@ -201,7 +201,7 @@ void resourceAttributesAddition(
       throws IOException {
 
     Otel2PrometheusConverter converter =
-        new Otel2PrometheusConverter(true, allowedResourceAttributesFilter);
+        new Otel2PrometheusConverter(allowedResourceAttributesFilter);
 
     ByteArrayOutputStream out = new ByteArrayOutputStream();
     MetricSnapshots snapshots = converter.convert(Collections.singletonList(metricData));
@@ -501,7 +501,7 @@ void validateCacheIsBounded() {
         };
 
     Otel2PrometheusConverter otel2PrometheusConverter =
-        new Otel2PrometheusConverter(true, /* allowedResourceAttributesFilter= */ countPredicate);
+        new Otel2PrometheusConverter(/* allowedResourceAttributesFilter= */ countPredicate);
 
     // Create 20 different metric data objects with 2 different resource attributes;
     Resource resource1 = Resource.builder().put("cluster", "cluster1").build();

exporters/prometheus/src/test/java/io/opentelemetry/exporter/prometheus/PrometheusHttpServerTest.java

@@ -413,7 +413,6 @@ void stringRepresentation() {
             "PrometheusHttpServer{"
                 + "host=localhost,"
                 + "port=0,"
-                + "otelScopeEnabled=true,"
                 + "allowedResourceAttributesFilter=null,"
                 + "memoryMode=REUSABLE_DATA,"
                 + "defaultAggregationSelector=DefaultAggregationSelector{COUNTER=default, UP_DOWN_COUNTER=default, HISTOGRAM=default, OBSERVABLE_COUNTER=default, OBSERVABLE_UP_DOWN_COUNTER=default, OBSERVABLE_GAUGE=default, GAUGE=default}"
@@ -528,7 +527,6 @@ void toBuilder() {
     PrometheusHttpServerBuilder builder = PrometheusHttpServer.builder();
     builder.setHost("localhost");
     builder.setPort(1234);
-    builder.setOtelScopeEnabled(false);
 
     Predicate<String> resourceAttributesFilter = s -> false;
     builder.setAllowedResourceAttributesFilter(resourceAttributesFilter);
@@ -555,7 +553,6 @@ public Result authenticate(HttpExchange exchange) {
         .isInstanceOf(PrometheusHttpServerBuilder.class)
         .hasFieldOrPropertyWithValue("host", "localhost")
         .hasFieldOrPropertyWithValue("port", 1234)
-        .hasFieldOrPropertyWithValue("otelScopeEnabled", false)
         .hasFieldOrPropertyWithValue("allowedResourceAttributesFilter", resourceAttributesFilter)
         .hasFieldOrPropertyWithValue("executor", executor)
         .hasFieldOrPropertyWithValue("prometheusRegistry", prometheusRegistry)

exporters/prometheus/src/test/java/io/opentelemetry/exporter/prometheus/PrometheusMetricReaderTest.java

@@ -61,7 +61,7 @@ class PrometheusMetricReaderTest {
   void setUp() {
     this.testClock.setTime(Instant.ofEpochMilli((System.currentTimeMillis() / 100) * 100));
     this.createdTimestamp = convertTimestamp(testClock.now());
-    this.reader = new PrometheusMetricReader(true, /* allowedResourceAttributesFilter= */ null);
+    this.reader = new PrometheusMetricReader(/* allowedResourceAttributesFilter= */ null);
     this.meter =
         SdkMeterProvider.builder()
             .setClock(testClock)
@@ -776,7 +776,7 @@ void exponentialHistogramBucketConversion() {
       int otelScale = random.nextInt(24) - 4;
       int prometheusScale = Math.min(otelScale, 8);
       PrometheusMetricReader reader =
-          new PrometheusMetricReader(true, /* allowedResourceAttributesFilter= */ null);
+          new PrometheusMetricReader(/* allowedResourceAttributesFilter= */ null);
       Meter meter =
           SdkMeterProvider.builder()
               .registerMetricReader(reader)
@@ -1027,9 +1027,9 @@ void otelScopeComplete() throws IOException {
   }
 
   @Test
-  void otelScopeDisabled() throws IOException {
+  void otelScopeLabelsOnly() throws IOException {
     PrometheusMetricReader reader =
-        new PrometheusMetricReader(false, /* allowedResourceAttributesFilter= */ null);
+        new PrometheusMetricReader(/* allowedResourceAttributesFilter= */ null);
     Meter meter =
         SdkMeterProvider.builder()
             .setClock(testClock)
@@ -1047,8 +1047,8 @@ void otelScopeDisabled() throws IOException {
             + "# TYPE target info\n"
             + "target_info{service_name=\"unknown_service:java\",telemetry_sdk_language=\"java\",telemetry_sdk_name=\"opentelemetry\",telemetry_sdk_version=\"1.x.x\"} 1\n"
             + "# TYPE test_count counter\n"
-            + "test_count_total 1.0\n"
-            + "test_count_created "
+            + "test_count_total{otel_scope_name=\"test-scope\",otel_scope_version=\"a.b.c\"} 1.0\n"
+            + "test_count_created{otel_scope_name=\"test-scope\",otel_scope_version=\"a.b.c\"} "
             + createdTimestamp
             + "\n"
             + "# EOF\n";
@@ -1059,8 +1059,7 @@ void otelScopeDisabled() throws IOException {
   @Test
   void addResourceAttributesWorks() throws IOException {
     PrometheusMetricReader reader =
-        new PrometheusMetricReader(
-            true, /* allowedResourceAttributesFilter= */ Predicates.is("cluster"));
+        new PrometheusMetricReader(/* allowedResourceAttributesFilter= */ Predicates.is("cluster"));
     Meter meter =
         SdkMeterProvider.builder()
             .setClock(testClock)
@@ -1091,6 +1090,14 @@ void addResourceAttributesWorks() throws IOException {
     assertThat(toOpenMetrics(reader.collect())).isEqualTo(expected);
   }
 
+  @SuppressWarnings("deprecation") // test deprecated constructor
+  @Test
+  void deprecatedConstructor() {
+    assertThat(new PrometheusMetricReader(false, null))
+        .usingRecursiveComparison()
+        .isEqualTo(new PrometheusMetricReader(null));
+  }
+
   /**
    * Unfortunately there is no easy way to use {@link TestClock} for Exemplar timestamps. Test if
    * {@code expected} equals {@code actual} but {@code <timestamp>} matches arbitrary timestamps.

sdk-extensions/incubator/src/test/java/io/opentelemetry/sdk/extension/incubator/fileconfig/MetricReaderFactoryTest.java

@@ -165,7 +165,6 @@ void create_PullPrometheusConfigured() throws IOException {
         PrometheusHttpServer.builder()
             .setHost("localhost")
             .setPort(port)
-            .setOtelScopeEnabled(false)
             .setAllowedResourceAttributesFilter(
                 IncludeExcludePredicate.createPatternMatching(
                     singletonList("foo"), singletonList("bar")))