Scheduled Service Change: Enterprise Manager upgrade to 11g latest
Users used to getting alert email notifications to their email or pager will not see any messages during this time.
There is no workaround for this issue
Enterprise Manager, which monitors state and performance of hosts, databases, and application level services (https://gridha.cit.cornell.edu/em) will be upgraded to the latest release 11g with PSU4 i.e. 188.8.131.52.4. During this time, the service will be unavailable.