What does sysmon do at runtime in Go?

At runtime, Go's sysmon is a system monitor responsible for executing background tasks related to scheduler management and garbage collection. Its main functions:

• Running periodic checks of goroutine and scheduler status.
• Initiating and coordinating garbage collection (GC).
• Ensuring timely context switching and preventing goroutine hangs.

sysmon runs in a separate system goroutine and helps maintain the performance and stability of Go programs, especially when there are many active goroutines.