Added maintenance announcement

Signed-off-by: kostyapenkov <[email protected]>

index.md

@@ -5,7 +5,8 @@ they are worked on. You can also get real-time updates of service outages
 on our [Slack channel](https://join.slack.com/t/foundriesio/shared_invite/enQtNTc5NDkxNTI5NTExLWQ1Yjc3NDA2MjI3NzA3YzkxYjEzNzlhZjQ0M2QxYTIzYmIzZjlmOThmZGU0NTk5MWEwZGIwMTU2YWE4N2I5NWQ).
 
 ### Planned/Ongoing Events:
-  No events
+ * [2021-05-19 Compute cluster upgrade](maintenance/2021-05-19-infra-compute-upgrade)
+
 
 ### Past Events:
  * [2021-03-19 Compute cluster upgrade](maintenance/2021-03-19-infra-compute-upgrade)

maintenance/2021-05-19-infra-compute-upgrade.md

@@ -0,0 +1,7 @@
+## Compute cluster upgrade
+
+On Wed, 2021-05-19, compute cluster will be upgraded.
+
+Our infrastructure team will upgrade control-plane components and some [foundries.io](https://foundries.io) services.
+During the maintenance, OTA and CI systems might have service interruption (expected downtime - less than 60s). Docker registry [hub.foundries.io](https://hub.foundries.io) might be unavailable up to 10 minutes.
+Performance of some [foundries.io](https://foundries.io) services might be impacted duirng the maintenance.