My incident-response talk from PEPR 2020 is here: When Things Go Wrong. Slides (with bonus section about how metrics are important but can really, really mess up your incident management) here.
Template incident-handing doc is available here, as promised in my talk. Add whatever’s useful for your company — this is a bare template which we used at Humu. The Humu incident-handling guidelines (edited to remove references to specific employees and internal systems) are available here.