Add host to DogstatsdConfiguration

service/src/main/java/org/whispersystems/textsecuregcm/configuration/DogstatsdConfiguration.java

@@ -22,6 +22,10 @@ public class DogstatsdConfiguration implements StatsdConfig {
   @NotBlank
   private String environment;
 
+  @JsonProperty
+  @NotBlank
+  private String host;
+
   @Override
   public Duration step() {
     return step;
@@ -41,4 +45,9 @@ public class DogstatsdConfiguration implements StatsdConfig {
     // We have no Micrometer key/value pairs to report, so always return `null`
     return null;
   }
+
+  @Override
+  public String host() {
+    return host;
+  }
 }