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All custom metrics
Job overran
This metric tells you whether a specific SQL Agent job that runs at exactly the same time every day has overrun its expected duration. Read more
Data not yet sent to the mirror
This metric tracks the amount of data waiting to be sent from the principal database to the mirror. This is known as the send queue. Read more
Current status of mirroring
Mirroring systems can go offline. This metric returns the current state of the mirroring system so you’ll know from a single value what the current status of your mirroring environment is. Read more
Current role of a database
This metric allows you to keep track of the role of a given database within your mirroring set up. The single value returned tells you whether the database is the principal or the mirror. Read more
Status of the witness
This metric returns a single value that tells you whether the witness is connected, disconnected or unknown. Knowing if it is offline can be as important as knowing if your mirrored databases are available. Read more
Long-running job
This metric returns the longest running instance of the named job in the last hour. By creating multiple custom metrics from this example – one for each job you’re interested in – you can specify alert thresholds for each job individually. Read more
Number of queries running
This metric counts how many queries are running, and alerts you if the value goes above a defined threshold. Read more
Database growth steps available
This metric measures the number of available autogrowth steps for a database, so you can see when they are reduced or increased because something else (e.g. another database) starts or stops taking up space, when storage is added, etc. Read more
Low physical/external memory
Determining if your operating system is causing memory issues within your SQL Server instance can be a challenge. One way around it is to use the sys.dm_os_ring_buffers to show when server memory is low. Read more