The following tables describe the metrics for client connections and the I/O between clients and the cluster.
Table B.6. Connections
| Metrics | Type | Description |
|---|---|---|
| voltdb_accepted_connections_total | Gauge | The total number of client connections opened since the server started, including connections that are now closed. |
| voltdb_client_connections_limit_total | Gauge | The maximum number of client connections allowed for the server. |
| voltdb_client_connections_open_total | Gauge | The number of client connections open on the server. |
| voltdb_dropped_connections_total | Gauge | The total number of connections that were rejected because the connection limit had been reached. |
Table B.7. I/O
| Metrics | Type | Description |
|---|---|---|
| voltdb_io_message_handled_total | Counter | The number of individual messages sent from the client to the host. |
| voltdb_io_message_written_total | Counter | The number of individual messages sent from the host to the client. |
| voltdb_io_network_inbound_queue_time_seconds | Histogram | The distribution of the time tasks were waiting in the queue for the execution on the remote node, initiated by this connection. |
| voltdb_io_network_outstanding_request_bytes_bytes | Gauge | The number of bytes of data sent from the client pending on the host. |
| voltdb_io_network_procedure_round_trip_time_seconds | Histogram | The distribution of the time taken to receive acknowledgment of the execution of the stored procedures on the leader node, initiated by this connection. |
| voltdb_io_network_read_bytes | Counter | The number of bytes of data sent from the client to the host. |
| voltdb_io_network_read_error_total | Counter | Number of times request has failed. |
| voltdb_io_network_replication_round_trip_time_seconds | Histogram | The distribution of the time it took to receive acknowledgment from the replica. |
| voltdb_io_network_write_bytes | Counter | The number of bytes of data sent from the host to the client. |
| voltdb_io_outstanding_messages_total | Gauge | The number of messages on the host queue waiting to be retrieved by the client. |
| voltdb_io_outstanding_response_messages_total | Gauge | Number of message scheduled to be sent to the client. |
| voltdb_io_tls_decryption_latency_seconds | Histogram | The distribution of decryption times. |
| voltdb_io_tls_encryption_latency_seconds | Histogram | The distribution of encryption times. |
| voltdb_io_tls_messages_decrypted_total | Counter | The number of messages decrypted with TLS. |
| voltdb_io_tls_messages_encrypted_total | Counter | The number of messages encrypted with TLS. |
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