Also has a reference, there was recently a PR to review the stock alerts and see which alerts should (as per our understanding) notify/awake people remove the noise by silencing alerts that dont need to wake up people by ktsaou · Pull Request #15590 · netdata/netdata · GitHub
As @Manolis_Vasilakis mentioned, if you find some that you would like to get notified on change the role to something else other than silent