This metric reports the number of connections that are currently blocked, divided by the total count of current connections.
Most well-balanced SQL Servers will have some degree of blocking. This metric attempts to measure the impact of lead blocking queries against other queries. Higher values indicate that many connections are being blocked, and queries should be tuned to reduce the amount of contention.
For more information, see INF: Understanding and resolving SQL Server blocking problems.Percentage of blocked connections,