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State Machine Gallery
Every meaningful mutation should have durable stages, gates, and known failure modes.
Deploy Pipeline
Control plane operation
queuedcloningbuildingvalidatingpreview_readyblockedfailed
Gates
generated artifacts current
Vango state impact classified
DB impact classified
secrets/providers bound
Failure modes
stale artifacts
build digest mismatch
cold deploy needs approval
migration blocks preview
Production Promotion
Promotion operation
requestedpolicy_checkroute_casedge_propagatinghealthyrolled_backfailed
Gates
preview artifact exactly matches
route epoch predecessor current
approval present if required
runtime services ready
Failure modes
late worker report
route epoch conflict
edge replay gap
DB rollback unsafe
Wake
Regional data plane
coldwake_requestedstartingreadiness_waithotfailedsleeping
Gates
request class safe to hold
wake budget available
allocation passes readiness
unsafe replay policy exists
Failure modes
payment webhook while cold
wake stampede
readiness timeout
old route epoch
Allocation Lifecycle
Scheduler and runner
plannedpullingstartingreadydrainingstoppedfailed
Gates
artifact digest verified
env/secrets mounted
health/readiness pass
drain deadline respected
Failure modes
runner crash
secret missing
OOM
session still active at drain deadline
Host Drain / OS Upgrade
Operations
cordonedevacuatingreplacement_readyupgradingpostcheckuncordoned
Gates
quorum remains healthy
runner headroom exists
active sessions can drain
drift checks pass
Failure modes
no headroom
active sessions pinned
provider outage
runner-agent regression
Region Enablement
Platform topology
requestedprovisioningbinding_servicesreplicating_artifactseligibledisabled
Gates
data topology ready
runtime services available
secrets present
residency allowed
Failure modes
artifact absent
DB not replicated
session store missing
residency policy violation
Database Migration
Pipeline/data operation
classifieddry_runlockedapplyingverifiedblockedfailed
Gates
expand/contract safe
backup/PITR posture known
old artifact compatibility checked
rollback plan explicit
Failure modes
destructive migration
old app incompatible
preview mutates production
manual lock timeout