Added maintenance announcement

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

index.md

@@ -6,7 +6,7 @@ on our [Slack channel](https://join.slack.com/t/foundriesio/shared_invite/enQtNT
 
 
 ### Planned/Ongoing Events:
-   No events
+ * [2021-03-16 Compute cluster upgrade](maintenance/2021-03-16-infra-compute-upgrade)
 
 ### Past Events:
  * [2021-02-07 source.foundries.io maintenance](maintenance/2021-02-07-source-fio)

maintenance/2021-03-16-infra-compute-upgrade.md

@@ -0,0 +1,6 @@
+## Compute cluster upgrade
+
+On Tue, 2021-03-16, 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.