The Exchange System Health Test monitors health sets (groups of monitors) and health information on your Exchange 2013/2016 server, verifying the state of each health set’s monitors. Monitors that are similar or are related to a component’s architecture are grouped to form a health set. Health sets provide the health information for applications and services such as Outlook Web App, Exchange ActiveSync, the Information Store service, content indexing, and transport services on your Exchange 2013 and Exchange 2016 servers.
The Active Directory Account Lockout Health test provides information about how many and which Active Directory accounts are currently locked out. The test shows accounts that are locked out due to invalid passwords being submitted and accounts that are locked because the password has expired.