# Metrics
# Serverless
EMQX Cloud provides four incremental metrics: Sessions, Messages, Traffic, and Dropped Messages. You can view the display chart corresponding to each indicator, and the detailed information at a certain point in time.
# Sessions
Displays the number of current sessions within a specified time period with indicator Sessions:
| Indicator | Description |
|---|---|
| Sessions | Number of sessions |
# Messages
Displays the incremental changes in messages sent and received within a given time period with indicator messages_received and messages_sent:
| Indicator | Description |
|---|---|
| messages_received | Number of messages received from the client |
| messages_sent | Number of messages sent to the client |
# Traffic
Displays the traffic generated by sending and receiving messages within a time period, with indicator send_kibibytes, received_kibibytes and total_kibibytes:
| Indicator | Description |
|---|---|
| send_kibibytes | Kilobytes of the sent messages |
| received_kibibytes | Kilobytes of the received messages |
| total_kibibytes | Total kilobytes of sent and received messages |
# Dropped Messages
Displays the incremental changes of the number of discarded messages within the time period, with indicator delivery_dropped, delivery_dropped_queue_full, and delivery_dropped_expire
| Indicator | Description |
|---|---|
| delivery_dropped | Number of messages dropped on send |
| delivery_dropped_queue_full | Number of messages dropped when the message queue is full |
| delivery_dropped_expire | Number of messages dropped due to message expiration |
# Dedicated
Metrics of the Dedicated Plan
# Message
It shows the incremental status of message sending and receiving in a certain period of time. The following 3 metrics are provided:
| Indicator | Description |
|---|---|
| messages_dropped | The total number of messages discarded before forwarding to the subscription process in EMQX |
| messages_received | Number of messages received from the client |
| messages_sent | Number of messages sent to the client |
# Client
Shows the incremental situation of interaction with the client in a certain period of time. The following 4 metrics are provided:
| Indicator | Description |
|---|---|
| client_connected | Number of successful client connections |
| client_disconnected | Number of client disconnections |
| client_subscribe | Number of client subscriptions |
| client_unsubscribe | Number of client unsubscriptions |
# Packets
It shows the increment of the number of bytes sent and received during the time period. The following 2 metrics are provided:
| Indicator | Description |
|---|---|
| send_kibibytes | Kilobytes of sent packet |
| received_kibibytes | Kilobytes of received packet |
# Delivery
It shows the increment of the number of discarded messages within a time period, and provides the following one indicator:
| Indicator | Description |
|---|---|
| delivery_dropped | Number of message dropped when sending |
| delivery_dropped_queue_full | Number of message dropped when the message queue is full |
