Fix Jaeger remote sampler declarative config polling interval key

sdk-extensions/declarative-config/src/test/java/io/opentelemetry/sdk/autoconfigure/declarativeconfig/SamplerFactoryTest.java

@@ -235,4 +235,45 @@ void create_SpiExporter_Valid() {
     assertThat(((SamplerComponentProvider.TestSampler) sampler).config.getString("key1"))
         .isEqualTo("value1");
   }
+
+  @Test
+  void create_JaegerRemote_interval() {
+    Sampler sampler =
+        SamplerFactory.getInstance()
+            .create(
+                new SamplerModel()
+                    .withJaegerRemoteDevelopment(
+                        new ExperimentalJaegerRemoteSamplerModel()
+                            .withEndpoint("http://jaeger-remote-endpoint")
+                            .withInterval(10_000)
+                            .withInitialSampler(
+                                new SamplerModel().withAlwaysOff(new AlwaysOffSamplerModel()))),
+                context);
+    cleanup.addCloseable(sampler);
+
+    assertThat(sampler)
+        .isInstanceOf(JaegerRemoteSampler.class)
+        .extracting("pollingIntervalMs")
+        .isEqualTo(10_000);
+  }
+
+  @Test
+  void create_JaegerRemote_intervalDefault() {
+    Sampler sampler =
+        SamplerFactory.getInstance()
+            .create(
+                new SamplerModel()
+                    .withJaegerRemoteDevelopment(
+                        new ExperimentalJaegerRemoteSamplerModel()
+                            .withEndpoint("http://jaeger-remote-endpoint")
+                            .withInitialSampler(
+                                new SamplerModel().withAlwaysOff(new AlwaysOffSamplerModel()))),
+                context);
+    cleanup.addCloseable(sampler);
+
+    assertThat(sampler)
+        .isInstanceOf(JaegerRemoteSampler.class)
+        .extracting("pollingIntervalMs")
+        .isEqualTo(60_000);
+  }
 }

sdk-extensions/jaeger-remote-sampler/src/main/java/io/opentelemetry/sdk/extension/trace/jaeger/sampler/JaegerRemoteSampler.java

@@ -37,6 +37,7 @@ public final class JaegerRemoteSampler implements Sampler {
   private static final String TYPE = "remoteSampling";
 
   private final String serviceName;
+  private final int pollingIntervalMs;
   private final ScheduledExecutorService pollExecutor;
   private final ScheduledFuture<?> pollFuture;
 
@@ -52,6 +53,7 @@ public final class JaegerRemoteSampler implements Sampler {
       int pollingIntervalMs,
       Sampler initialSampler) {
     this.serviceName = serviceName != null ? serviceName : "";
+    this.pollingIntervalMs = pollingIntervalMs;
     this.grpcSender = grpcSender;
     this.sampler = initialSampler;
     pollExecutor = Executors.newScheduledThreadPool(1, new DaemonThreadFactory(WORKER_THREAD_NAME));
@@ -174,6 +176,11 @@ Sampler getSampler() {
     return this.sampler;
   }
 
+  // Visible for testing
+  int getPollingIntervalMs() {
+    return this.pollingIntervalMs;
+  }
+
   public static JaegerRemoteSamplerBuilder builder() {
     return new JaegerRemoteSamplerBuilder();
   }

sdk-extensions/jaeger-remote-sampler/src/main/java/io/opentelemetry/sdk/extension/trace/jaeger/sampler/internal/JaegerRemoteSamplerComponentProvider.java

@@ -47,7 +47,7 @@ public Sampler create(DeclarativeConfigProperties config) {
     }
     builder.setInitialSampler(DeclarativeConfiguration.createSampler(initialSamplerModel));
 
-    Long pollingIntervalMs = config.getLong("internal");
+    Long pollingIntervalMs = config.getLong("interval");
     if (pollingIntervalMs != null) {
       builder.setPollingInterval(Duration.ofMillis(pollingIntervalMs));
     }