added warning about discontinued regions, closes influxdata/DAR#369 (#4770)

content/influxdb/cloud/reference/regions.md

@@ -19,6 +19,24 @@ Use the URLs below to interact with your InfluxDB Cloud instances with the
 
 <a href="https://www.influxdata.com/influxdb-cloud-2-0-provider-region/" target="_blank" class="btn">Request a cloud region</a>
 
+{{% warn %}}
+#### Discontinued InfluxDB Cloud regions
+
+The InfluxDB Cloud service will be discontinued in the following regions as of
+**June 30, 2023**:
+
+##### Amazon Web Services (AWS):
+- **Asia Pacific - Sydney** (ap-southeast-2)
+
+##### Google Cloud Platform (GCP):
+- **Europe West - Belgium** (europe-west1)
+
+To continue service after **June 30, 2023**, InfluxDB Cloud accounts in these
+regions must be migrated to different regions.
+For information about migrating to a different region, see
+[Migrate to an account in a new region](/influxdb/cloud/migrate-regions/).
+{{% /warn %}}
+
 {{% note %}}
 #### Regions with multiple clusters
 Some InfluxDB Cloud regions have multiple Cloud clusters, each with a unique URL.