Reversion Safety tools for overseer and subsystems (#3104)

* guide: reversion safety

* guide: manage reversion safety in subsystems

* add leaf status to ActivatedLeaf

* add an LRU-cache to overseer for staleness detection

* update ActivatedLeaf usages in tests to contain status field

* add variant where missed accidentally

* add some helpers to LeafStatus

* address grumbles
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Robert Habermeier authored and GitHub committed 2021-05-31 20:54:05 +02:00
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@@ -15,7 +15,7 @@ Output:
## Functionality
Upon receipt of an `ActiveLeavesUpdate`, launch bitfield signing job for each `activated` head. Stop the job for each `deactivated` head.
Upon receipt of an `ActiveLeavesUpdate`, launch bitfield signing job for each `activated` head referring to a fresh leaf. Stop the job for each `deactivated` head.
## Bitfield Signing Job