change polling interval property name to match spec (#6672)

Co-authored-by: Jack Berg <[email protected]>

Author: drewhammond

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

@@ -10,16 +10,21 @@
 import io.opentelemetry.sdk.trace.samplers.Sampler;
 import java.util.Map;
 import java.util.concurrent.TimeUnit;
+import java.util.logging.Level;
+import java.util.logging.Logger;
 
 public class JaegerRemoteSamplerProvider implements ConfigurableSamplerProvider {
 
+  private static final Logger LOGGER =
+      Logger.getLogger(JaegerRemoteSamplerProvider.class.getName());
+
   // visible for testing
   static final String ATTRIBUTE_PROPERTY = "otel.resource.attributes";
   static final String SERVICE_NAME_PROPERTY = "otel.service.name";
   static final String SAMPLER_ARG_PROPERTY = "otel.traces.sampler.arg";
   static final String RESOURCE_ATTRIBUTE_SERVICE_NAME_PROPERTY = "service.name";
   private static final String ENDPOINT_KEY = "endpoint";
-  private static final String POLLING_INTERVAL = "pollingInterval";
+  private static final String POLLING_INTERVAL = "pollingIntervalMs";
   private static final String INITIAL_SAMPLING_RATE = "initialSamplingRate";
 
   @Override
@@ -43,9 +48,23 @@ public Sampler createSampler(ConfigProperties config) {
       builder.setEndpoint(endpoint);
     }
     String pollingInterval = params.get(POLLING_INTERVAL);
+    // Previously, we mistakenly read from pollingInterval. For backwards compatibility, check
+    // pollingInterval and log warning if set.
+    if (pollingInterval == null) {
+      pollingInterval = params.get("pollingInterval");
+      if (pollingInterval != null) {
+        LOGGER.log(
+            Level.WARNING,
+            SAMPLER_ARG_PROPERTY
+                + " contains deprecated \"pollingInterval\" property. Please use \""
+                + POLLING_INTERVAL
+                + "\" instead.");
+      }
+    }
     if (pollingInterval != null) {
       builder.setPollingInterval(Integer.valueOf(pollingInterval), TimeUnit.MILLISECONDS);
     }
+
     String initialSamplingRate = params.get(INITIAL_SAMPLING_RATE);
     if (initialSamplingRate != null) {
       builder.setInitialSampler(

sdk-extensions/jaeger-remote-sampler/src/test/java/io/opentelemetry/sdk/extension/trace/jaeger/sampler/JaegerRemoteSamplerProviderTest.java

@@ -34,7 +34,7 @@ void serviceProvider() {
         .thenReturn("test_service");
     HashMap<String, String> samplerArgs = new HashMap<>();
     samplerArgs.put("endpoint", "http://localhost:9999");
-    samplerArgs.put("pollingInterval", "99");
+    samplerArgs.put("pollingIntervalMs", "99");
     double samplingRate = 0.33;
     samplerArgs.put("initialSamplingRate", String.valueOf(samplingRate));
     when(mockConfig.getMap(JaegerRemoteSamplerProvider.SAMPLER_ARG_PROPERTY))