PgBouncer migration docs (#44)

Author: levkk

docs/configuration/pgdog.toml/databases.md

@@ -87,6 +87,14 @@ Overrides the [`default_pool_size`](general.md#default_pool_size) setting. All c
 !!! note "Recommendation"
     We strongly recommend keeping this value well below the supported connections of the backend database(s) to allow connections for maintenance in high load scenarios.
 
+### `pooler_mode`
+
+Overrides the [`pooler_mode`](general.md#pooler_mode) setting. Connections to this database will use this connection pool mode.
+
+### `min_pool_size`
+
+Overrides the [`min_pool_size`](general.md#min_pool_size) setting. The connection pool will maintain at minimum this many connections.
+
 ### `statement_timeout`
 
 This setting configures the `statement_timeout` connection parameter on all connections to Postgres for this database.

docs/configuration/pgdog.toml/general.md

@@ -212,6 +212,12 @@ Maximum amount of time new clients have to complete authentication. Clients that
 
 Default: **`60_000`** (60s)
 
+### `server_lifetime`
+
+Maximum amount of time a server connection is allowed to exist. Any connections exceeding this limit will be closed once they are checked back into the pool.
+
+Default: **`86400000`** (24h)
+
 ## Load balancer
 
 ### `load_balancing_strategy`
@@ -401,3 +407,11 @@ Default: **`true`** (enabled)
 How often to calculate averages shown in `SHOW STATS` [admin](../../administration/index.md) command and the [Prometheus](../../features/metrics.md) metrics.
 
 Default: **`15_000`** (15s)
+
+## DNS
+
+### `dns_ttl`
+
+Overrides the TTL set on DNS records received from DNS servers. Allows for faster failover when the primary/replica hostnames are changed by the database hosting provider.
+
+Default: **none** (disabled)

docs/configuration/pgdog.toml/network.md

@@ -20,7 +20,7 @@ To be consistent with the rest of PgDog documentation, units of time are in mill
 !!! note "Support for keep-alives"
     Not all networks support or play well with TCP keep-alives. If you see an increased number of dropped connections after enabling these settings, you may have to disable them.
 
-### `keepalives`
+### `keepalive`
 
 Enable TCP keep-alives. When enabled, idle client & server connections will send keep-alive packets to make sure the TCP connections are healthy.
 

docs/migrating-to-pgdog/.pages

@@ -0,0 +1 @@
+title: Migrating to PgDog