Root supervisor:one-for-one · 2 in 5 sSupervisor A:one-for-one · 3 in 5 sSupervisor B:one-for-all · 2 in 5 sSupervisor C:rest-for-one · 3 in 5 sSupervisor Dsimple_one_for_one · 3 in 5 sa1:permanenta2:transienta3:temporaryb1:permanentb2:permanentc1:permanentc2:permanentc3:permanenti1instancei2instancei3on demandWorkers are spawn-linked by their supervisor. Supervisors trap exits.Budget: max restarts in max seconds, the OTP intensity and period. OTP's default is 1 in 5 s.Silk OTP messagecallexit signalstop requests go down as messages · exit signals come up · start_link is a call