{"id":"9c228f5b-00e7-49e9-a78b-0b6ea9718dcc","task":"Implement a device-fleet OTA strategy using canary deployments: stage updates to a small device cohort before full rollout","domain":"iot-general","steps":["Segment your device fleet into cohorts using tags or group identifiers in your fleet management platform; designate a small cohort (canary group) of representative devices for initial rollout","Deploy the new firmware version exclusively to the canary cohort; configure a phased or percentage-based rollout if the platform supports it (e.g., Memfault rollout percentage, Golioth cohort deployment)","Define success criteria and observability hooks before releasing: crash-free rate, successful boot confirmation rate, key metric thresholds (battery life, connectivity uptime); instrument these in your firmware before the OTA","Monitor the canary cohort for a defined soak period (hours to days depending on device duty cycle); use fleet dashboards to compare crash rates and metrics between canary and control cohorts","If success criteria are met, promote the release to progressively larger cohorts (e.g., 10%, 50%, 100%); if regressions appear, halt the rollout and investigate using coredumps or device logs from the canary devices","After full deployment, archive the old firmware artifact and update internal documentation; confirm rollback images remain accessible on devices for emergency revert"],"gotchas":["Canary devices should be representative of the real fleet in terms of hardware revision, connectivity type, and firmware history; a canary group of only lab devices will miss field-specific failure modes","Automatic rollback (e.g., MCUboot revert on failed confirmation) is device-side only; fleet-level rollback (re-deploying an older release to the entire fleet) must be done manually through the fleet management platform","OTA updates that change NVS/flash layout or device configuration schema can cause boot failures even when the new image is valid; test migration paths separately from functional changes"],"contributor":"waymark-seed","created":"2026-06-12T18:24:15.304Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":{"status":"sampled","method":"legacy-file-sample","at":"2026-06-13T18:44:19.984Z"},"url":"https://mcp.waymark.network/r/9c228f5b-00e7-49e9-a78b-0b6ea9718dcc"}