Logging improvements

 /**
  * Copyright © 2016-2018 The Thingsboard Authors
- *
+ * <p>
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
+ * <p>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p>
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
@@ -37,6 +37,7 @@ import org.thingsboard.server.common.data.kv.ReadTsKvQuery;
 import org.thingsboard.server.common.data.kv.TsKvEntry;
 import org.thingsboard.server.dao.attributes.AttributesService;
 import org.thingsboard.server.dao.timeseries.TimeseriesService;
+import org.thingsboard.server.dao.util.TenantRateLimitException;
 import org.thingsboard.server.service.security.AccessValidator;
 import org.thingsboard.server.service.security.ValidationCallback;
 import org.thingsboard.server.service.security.ValidationResult;
@@ -403,7 +404,11 @@ public class DefaultTelemetryWebSocketService implements TelemetryWebSocketServi
 
             @Override
             public void onFailure(Throwable e) {
-                log.error(FAILED_TO_FETCH_DATA, e);
+                if (e instanceof TenantRateLimitException || e.getCause() instanceof TenantRateLimitException) {
+                    log.trace("[{}] Tenant rate limit detected for subscription: [{}]:{}", sessionRef.getSecurityCtx().getTenantId(), entityId, cmd);
+                } else {
+                    log.info(FAILED_TO_FETCH_DATA, e);
+                }
                 SubscriptionUpdate update = new SubscriptionUpdate(cmd.getCmdId(), SubscriptionErrorCode.INTERNAL_ERROR,
                         FAILED_TO_FETCH_DATA);
                 sendWsMsg(sessionRef, update);

@@ -41,11 +41,11 @@
     </appender>
 
     <logger name="org.thingsboard.server" level="INFO" />
-    <logger name="akka" level="INFO" />
+    <logger name="com.google.common.util.concurrent.AggregateFuture" level="OFF" />
 
     <root level="INFO">
         <appender-ref ref="fileLogAppender"/>
         <appender-ref ref="STDOUT"/>
     </root>
 
-</configuration>
\ No newline at end of file
+</configuration>