Added maintenance announcement

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

index.md

@@ -5,10 +5,12 @@ 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
+ * [2021-10-06 Compute cluster upgrade](maintenance/2021-10-06-infra-compute-upgrade)
 
 
 ### Past Events:
+ * [2021-07-07 hub.foundries.io upgrade](maintenance/2021-07-07-hub-upgrade.md)
+ * [2021-05-19 Compute cluster upgrade](maintenance/2021-05-19-infra-compute-upgrade)
  * [2021-03-19 Compute cluster upgrade](maintenance/2021-03-19-infra-compute-upgrade)
  * [2021-03-16 Compute cluster upgrade](maintenance/2021-03-16-infra-compute-upgrade)
  * [2021-02-07 source.foundries.io maintenance](maintenance/2021-02-07-source-fio)
@@ -17,8 +19,6 @@ on our [Slack channel](https://join.slack.com/t/foundriesio/shared_invite/enQtNT
  * [2020-09-28 Compute cluster upgrade](maintenance/2020-09-28-infra-compute-upgrade)
  * [2020-09-22 Compute cluster upgrade](maintenance/2020-09-22-infra-compute-upgrade)
  * [2020-02-12 CI worker network maintenance](maintenance/2020-02-13-online-net)
- * [2021-05-19 Compute cluster upgrade](maintenance/2021-05-19-infra-compute-upgrade)
- * [2021-07-07 hub.foundries.io upgrade](maintenance/2021-07-07-hub-upgrade.md)
 
 ### Previous Outages:
  * [2021-03-17 Networking issues on cloud-provider side](https://status.cloud.google.com/incident/cloud-networking/21006)

maintenance/2021-10-06-infra-compute-upgrade.md

@@ -0,0 +1,7 @@
+## Compute cluster upgrade
+
+On Wed, 2021-10-06, 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 5 minutes). 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.