Update scaling documentation (#7177)

* Update scaling documentation

* RM unvated changes

Author: benmoriceau

docs/operator-guides/scaling-airbyte.md

@@ -51,6 +51,15 @@ To be safe, make sure the Kubernetes cluster can schedule up to `2 x <number-of-
 
 This is a **non-issue** for users running Airbyte Docker.
 
+### Temporal DB
+
+Temporal maintains multiple idle connexions. By the default value is `20` and you may want to lower or increase this number. One issue we noticed is
+that temporal creates multiple pools and the number specified in the `SQL_MAX_IDLE_CONNS` environment variable of the `docker.compose.yaml` file
+might end up allowing 4-5 times more connexions than expected.
+
+If you want tho increase the amount of allowed idle connexion, you will also need to increase `SQL_MAX_CONNS` as well because `SQL_MAX_IDLE_CONNS`
+is capped by `SQL_MAX_CONNS`.
+
 ## Feedback
 
 The advice here is best-effort and by no means comprehensive. Please reach out on Slack if anything doesn't make sense or if something can be improved.