Go to your server cfg/sourcemod folder and find sourcemod.cfg
find the cvar and edit it to the value you want:
(0 means it wont announce to anyone, not even admins)
Code:
// Specifies how admin activity should be relayed to users. Add up the values
// below to get the functionality you want.
// 1: Show admin activity to non-admins anonymously.
// 2: If 1 is specified, admin names will be shown.
// 4: Show admin activity to admins anonymously.
// 8: If 4 is specified, admin names will be shown.
// 16: Always show admin names to root users.
// --
// Default: 13 (1+4+8)
sm_show_activity 0
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