# Metrics

Performance metrics and diagnostic information can be obtained from the C/C++
driver using [`cass_session_get_metrics()`](https://cpp-rs-driver.docs.scylladb.com/stable/api/struct.CassSession#1ab3773670c98c00290bad48a6df0f9eae). The resulting [`CassMetrics`](https://cpp-rs-driver.docs.scylladb.com/stable/api/struct.CassMetrics) object
contains several useful metrics for accessing request performance and/or
debugging issues.

```c
CassSession* session = cass_session_new();

/* Connect session */

CassMetrics metrics;

/* Get a snapshot of the driver's metrics */
cass_session_get_metrics(session, &metrics);

/* Run queries */

cass_session_free(session);
```

## Request metrics

The [`requests`](https://cpp-rs-driver.docs.scylladb.com/stable/api/struct.CassMetrics#attribute-requests) field  contains information about request latency and
throughput. All latency times are in microseconds and throughput
numbers are in requests per seconds.

## Statistics

The [`stats`](https://cpp-rs-driver.docs.scylladb.com/stable/api/struct.CassMetrics#attribute-stats) field contains information about the total number of connections.

## Errors

The [`errors`](https://cpp-rs-driver.docs.scylladb.com/stable/api/struct.CassMetrics#attribute-errors) field contains information about the
occurrence of requests and connection timeouts. Request timeouts occur when
a request fails to get a timely response.
Connection timeouts occur when the process of establishing new connections is
unresponsive.