Make the Graphite export protocol configurable

Closes gh-10523

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

@@ -19,6 +19,8 @@ package org.springframework.boot.actuate.autoconfigure.metrics.export.graphite;
 import java.time.Duration;
 import java.util.concurrent.TimeUnit;
 
+import io.micrometer.graphite.GraphiteProtocol;
+
 import org.springframework.boot.context.properties.ConfigurationProperties;
 
 /**
@@ -29,6 +31,7 @@ import org.springframework.boot.context.properties.ConfigurationProperties;
  */
 @ConfigurationProperties(prefix = "spring.metrics.graphite")
 public class GraphiteProperties {
+
 	/**
 	 * Enable publishing to the backend.
 	 */
@@ -59,6 +62,11 @@ public class GraphiteProperties {
 	 */
 	private Integer port;
 
+	/**
+	 * Protocol to use while shipping data to Graphite.
+	 */
+	private GraphiteProtocol protocol = GraphiteProtocol.Pickled;
+
 	public Boolean getEnabled() {
 		return this.enabled;
 	}
@@ -106,4 +114,13 @@ public class GraphiteProperties {
 	public void setPort(Integer port) {
 		this.port = port;
 	}
+
+	public GraphiteProtocol getProtocol() {
+		return this.protocol;
+	}
+
+	public void setProtocol(GraphiteProtocol protocol) {
+		this.protocol = protocol;
+	}
+
 }

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

@@ -20,6 +20,7 @@ import java.time.Duration;
 import java.util.concurrent.TimeUnit;
 
 import io.micrometer.graphite.GraphiteConfig;
+import io.micrometer.graphite.GraphiteProtocol;
 
 import org.springframework.boot.actuate.autoconfigure.metrics.export.PropertiesConfigAdapter;
 
@@ -74,4 +75,9 @@ class GraphitePropertiesConfigAdapter
 		return get(GraphiteProperties::getPort, GraphiteConfig::port);
 	}
 
+	@Override
+	public GraphiteProtocol protocol() {
+		return get(GraphiteProperties::getProtocol, GraphiteConfig::protocol);
+	}
+
 }