Update metrics.mdx

Author: thomasgauvin

src/content/docs/hyperdrive/observability/metrics.mdx

@@ -19,7 +19,7 @@ Hyperdrive currently exports the below metrics as part of the `hyperdriveQueries
 | Query Bytes        | `queryBytes`        | The size of your queries, in bytes.                                                                                                                                                                               |
 | Result Bytes       | `resultBytes`       | The size of your query *results*, in bytes.                                                                                                                                                                       |
 | Connection Latency | `connectionLatency` | The time (in milliseconds) required to establish new connections from Hyperdrive to your database.                                                                                                                |
-| Query Latency      | `queryLatency`      | The time (in milliseconds) required to query (and receive results) from your database.                                                                                                                            |
+| Query Latency      | `queryLatency`      | The time (in milliseconds) required to query (and receive results) from your database, as measured from your Hyperdrive connection pool(s).                                                                                                                            |
 | Event Status       | `eventStatus`       | Whether a query responded successfully (`complete`) or failed (`error`).                                                                                                                                          |
 
 Metrics can be queried (and are retained) for the past 31 days.