Drop API keys from Micrometer configuration.

service/src/main/java/org/whispersystems/textsecuregcm/WhisperServerService.java

@@ -230,11 +230,6 @@ public class WhisperServerService extends Application<WhisperServerConfiguration
       public String uri() {
         return config.getMicrometerConfiguration().getUri();
       }
-
-      @Override
-      public String apiToken() {
-        return config.getMicrometerConfiguration().getApiKey();
-      }
     }, Clock.SYSTEM) {
       @Override
       protected DistributionStatisticConfig defaultHistogramConfig() {

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

@@ -14,15 +14,7 @@ public class MicrometerConfiguration {
     @JsonProperty
     private String uri;
 
-    @JsonProperty
-    @NotEmpty
-    private String apiKey;
-
     public String getUri() {
         return uri;
     }
-
-    public String getApiKey() {
-        return apiKey;
-    }
 }