Add getters for AlertEvent (#5522)

* Add getters for AlertEvent

* Move PublicApi and ExtensionPoint to java-util

* Fix publicapi annotation usage

* Add publicapi annotations to ServiceMetricEvent and RequestLogEvent

java-util/src/main/java/io/druid/java/util/emitter/service/AlertEvent.java

@@ -21,14 +21,17 @@ package io.druid.java.util.emitter.service;
 
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.google.common.collect.ImmutableMap;
+import io.druid.guice.annotations.PublicApi;
 import io.druid.java.util.common.DateTimes;
 import io.druid.java.util.emitter.core.Event;
 import org.joda.time.DateTime;
 
+import java.util.Collections;
 import java.util.Map;
 
 /**
  */
+@PublicApi
 public class AlertEvent implements Event
 {
   private final ImmutableMap<String, String> serviceDimensions;
@@ -106,6 +109,24 @@ public class AlertEvent implements Event
     return "alerts";
   }
 
+  /*
+   * This method is used in certain proprietary emitter extensions
+   */
+  @SuppressWarnings("unused")
+  public String getService()
+  {
+    return serviceDimensions.get("service");
+  }
+
+  /*
+   * This method is used in certain proprietary emitter extensions
+   */
+  @SuppressWarnings("unused")
+  public String getHost()
+  {
+    return serviceDimensions.get("host");
+  }
+
   public Severity getSeverity()
   {
     return severity;
@@ -116,6 +137,15 @@ public class AlertEvent implements Event
     return description;
   }
 
+  /*
+   * This method is used in certain proprietary emitter extensions
+   */
+  @SuppressWarnings("unused")
+  public Map<String, Object> getDataMap()
+  {
+    return Collections.unmodifiableMap(dataMap);
+  }
+
   @Override
   @JsonValue
   public Map<String, Object> toMap()

java-util/src/main/java/io/druid/java/util/emitter/service/ServiceMetricEvent.java

@@ -23,6 +23,7 @@ import com.fasterxml.jackson.annotation.JsonValue;
 import com.google.common.base.Predicate;
 import com.google.common.collect.ImmutableMap;
 import com.google.common.collect.Maps;
+import io.druid.guice.annotations.PublicApi;
 import io.druid.java.util.common.DateTimes;
 import io.druid.java.util.common.ISE;
 import io.druid.java.util.emitter.core.Event;
@@ -33,6 +34,7 @@ import java.util.Map;
 
 /**
  */
+@PublicApi
 public class ServiceMetricEvent implements Event
 {
   public static Builder builder()

server/src/main/java/io/druid/server/log/EmittingRequestLogger.java

@@ -22,6 +22,7 @@ package io.druid.server.log;
 import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.google.common.collect.ImmutableMap;
+import io.druid.guice.annotations.PublicApi;
 import io.druid.java.util.emitter.core.Event;
 import io.druid.java.util.emitter.service.ServiceEmitter;
 import io.druid.java.util.emitter.service.ServiceEventBuilder;
@@ -58,6 +59,7 @@ public class EmittingRequestLogger implements RequestLogger
            '}';
   }
 
+  @PublicApi
   public static class RequestLogEvent implements Event
   {
     final ImmutableMap<String, String> serviceDimensions;