This section in perfdump has two numbers:
Number of connections in keep-alive mode, also known as the total number of connections added
Maximum number of connections allowed in keep-alive mode simultaneously, also known as the maximum connection size
The maximum number of connections allowed in keep-alive mode can be configured using the MaxKeepAliveConnections magnus.conf directive.
The number of connections specified by the maximum connections setting is divided equally among the keep-alive threads. If the maximum connections setting is not equally divisible by the keep-alive threads setting, the server might allow slightly more than the maximum number of simultaneous keep-alive connections.