Observation Freshness SLO · Config Workshop

Generated at: 2026-07-30T12:38:02.000Z UTC · source: committed helm-expt evidence for this rendered repository document.

ConfigHub is workerless in this proof model. It stores desired/config truth and submitted observation receipts; it does not claim fresh live cluster truth unless a current receipt says so.

Receipt Contract

Every live observation receipt must record:

observer.name and observer.method
target.kind, target.name, and, where applicable, context and namespace
variantRevision
renderedObjectSetSHA256
payload digest or check evidence digest
observedAt
freshnessTTL
result
checks

Status Rules

fresh: observedAt + freshnessTTL is still in the future and result is pass or warn.
stale: the freshness window has expired.
failed: the receipt result is fail or blocked.
unknown: the receipt exists but lacks enough timing, target, or check data to make a freshness claim.
not-observed: no receipt exists for the target and variant revision.
drifted: a current receipt says the live target differs from the approved rendered object set.

Default SLO

For local kind proof runs, the default freshnessTTL is 1h. For customer or production demonstrations, the TTL should be chosen by the target owner and shown next to the receipt. A stale receipt is still audit evidence; it is not a fresh live-state claim.

Minimum Redis Live Proof

The Redis proof is the minimum live observation shape for this repo:

receipt path: runs/redis-local-kind/latest/observation-receipt.yaml
target: local kind cluster helm-expt-redis, namespace redis
rendered digest: 362dbc4854421a23ea48da4ee7e72dbc98422fa9affc26ac372c761d4b90e10d
required checks: namespace support object applied, both Redis StatefulSets rolled out, Redis PING returned PONG, and four PVCs were bound

Other chart live receipts may use chart-specific checks, but they must keep the same freshness contract: observer, target, rendered digest, timestamp, TTL, result, and check list.

Why This Matters

This keeps the promise crisp: ConfigHub can show what was intended, rendered, scanned, uploaded, applied, and observed. It only says a cluster is currently OK when a fresh observation receipt says so.