There is a dead man’s switch service [1] which can send an email if you die. In theory if you self host you could trigger something when their email arrives to an inbox you control.
I’ve been thinking of making a version of this that does a webhook but it doesn’t offer a huge amount of value over the email method.
Is the dead man's switch necessary? Unless your homelab contains secrets you don't want revealed until after your death, I'd just put this in a Google doc.
Depends how convoluted your setup is. For some use cases releasing the location of passwords physically written down might help matters or maybe trigger a process to export all data and upload somewhere - somehow.
Seeing some of the discussions around home labs with server racks and k8s doesn’t fill me with confidence that for a majority of use cases a family member would be able to get the data if needed.
I’ve been thinking of making a version of this that does a webhook but it doesn’t offer a huge amount of value over the email method.