| Error | Error occurred during the operation.<br> The available values for MQTT: RequestCount, MQTT: Failed Published Messages, MQTT: Failed Subscription Operations metrics include: <br><br>-QuotaExceeded: the client exceeded one or more of the throttling limits that resulted in a failure <br>- AuthenticationError: a failure because of any authentication reasons. <br>- AuthorizationError: a failure because of any authorization reasons.<br>- ClientError: the client sent a bad request or used one of the unsupported features that resulted in a failure. <br>- ServiceError: a failure because of an unexpected server error or for a server's operational reason. <br><br> [Learn more about how the supported MQTT features.](mqtt-support.md) <br><br>The available values for MQTT: Failed Routed Messages metric include: <br><br>-AuthenticationError: the EventGrid Data Sender role for the custom topic configured as the destination for MQTT routed messages was deleted. <br>-TopicNotFoundError: The custom topic that is configured to receive all the MQTT routed messages was deleted. <br>-TooManyRequests: the number of MQTT routed messages per second exceeds the limit of the destination (namespace topic or custom topic) for MQTT routed messages. <br>- ServiceError: a failure because of an unexpected server error or for a server's operational reason. <br><br> [Learn more about how the MQTT broker handles each of these routing errors.](mqtt-routing.md#mqtt-message-routing-behavior)|
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