CitusIO journal

Field notes from the IoT data plane.

Product news, engineering decisions, and practical guidance for teams running device infrastructure.

Before a standby can take traffic

Exclude the old writer, acquire the current term, replay durable state and require fresh whole-node readiness.

Use exact images, offered traffic, sink receipts and thermal conditions to judge whether a measurement applies to your deployment.

Use the panel or your own agent to inspect current scope and follow a single command through daemon-owned reconciliation.

Reuse nginx connection and TLS operations while keeping shared message state and external delivery behind explicit process boundaries.

Map live readings, restart recovery, integrations and standby operation to the product scope your application needs.

Map effective behavior, test an isolated candidate and preserve state and rollback decisions before assigning traffic.