feat(dbaas): session support (#403)

CHANGELOG.md

@@ -8,6 +8,7 @@ See updating [Changelog example here](https://keepachangelog.com/en/1.0.0/)
 ### Added
 - gateway: add read-only `addresses` field
 - kubernetes: `control_plane_ip_filter` field to `upcloud_kubernetes_cluster` resource
+- dbaas: `upcloud_managed_database_mysql_sessions`, `upcloud_managed_database_postgresql_sessions` and `upcloud_managed_database_redis_sessions` data sources
 
 ### Changed
 - kubernetes: remove node group maximum value validation. The maximum number of nodes (in the cluster) is determined by the cluster plan and the validation is done on the API side.

examples/data-sources/upcloud_managed_database_mysql_sessions/data-source.tf

@@ -0,0 +1,13 @@
+# Use data source to gather a list of the active sessions for a Managed MySQL Database
+
+# Create a Managed MySQL resource
+resource "upcloud_managed_database_mysql" "example" {
+  name = "mysql-example1"
+  plan = "1x1xCPU-2GB-25GB"
+  zone = "fi-hel1"
+}
+
+# Read the active sessions of the newly created service
+data "upcloud_managed_database_mysql_sessions" "example" {
+  service = upcloud_managed_database_mysql.example.id
+}

examples/data-sources/upcloud_managed_database_postgresql_sessions/data-source.tf

@@ -0,0 +1,13 @@
+# Use data source to gather a list of the active sessions for a Managed PostgreSQL Database
+
+# Create a Managed PostgreSQL resource
+resource "upcloud_managed_database_postgresql" "example" {
+  name = "mysql-example1"
+  plan = "1x1xCPU-2GB-25GB"
+  zone = "fi-hel1"
+}
+
+# Read the active sessions of the newly created service
+data "upcloud_managed_database_postgresql_sessions" "example" {
+  service = upcloud_managed_database_postgresql.example.id
+}

examples/data-sources/upcloud_managed_database_redis_sessions/data-source.tf

@@ -0,0 +1,13 @@
+# Use data source to gather a list of the active sessions for a Managed Redis Database
+
+# Create a Managed Redis resource
+resource "upcloud_managed_database_redis" "example" {
+  name = "example"
+  plan = "1x1xCPU-2GB"
+  zone = "fi-hel2"
+}
+
+# Read the active sessions of the newly created service
+data "upcloud_managed_database_redis_sessions" "example" {
+  service = upcloud_managed_database_redis.example.id
+}