Add SignalFxConfig source property

See gh-12066

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/metrics/export/signalfx/SignalFxProperties.java

@@ -39,6 +39,11 @@ public class SignalFxProperties extends StepRegistryProperties {
 	 */
 	private String uri;
 
+	/**
+	 * Uniquely identifies the app instance that is publishing metrics to SignalFx. Defaults to the local host name.
+	 */
+	private String source;
+
 	public String getAccessToken() {
 		return this.accessToken;
 	}
@@ -55,4 +60,12 @@ public class SignalFxProperties extends StepRegistryProperties {
 		this.uri = uri;
 	}
 
+	public String getSource() {
+		return source;
+	}
+
+	public void setSource(String source) {
+		this.source = source;
+	}
+
 }

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/metrics/export/signalfx/SignalFxPropertiesConfigAdapter.java

@@ -44,4 +44,9 @@ public class SignalFxPropertiesConfigAdapter
 		return get(SignalFxProperties::getUri, SignalFxConfig.super::uri);
 	}
 
+	@Override
+	public String source() {
+		return get(SignalFxProperties::getSource, SignalFxConfig.super::source);
+	}
+
 }