[7.x] [Alerting] document requirements for developing new action types (#69164)#70684

Merged

pmuellr merged 1 commit intoelastic:7.xfrom pmuellr:backport/7.x/pr-69164

Jul 3, 2020

+37

Commits on Jul 3, 2020

[Alerting] document requirements for developing new action types (elastic#69164 )
pmuellr
committed