Aglet

Learn from recurring version skew in deployments

Recurring skew usually means the release sequence or context leaves compatibility assumptions implicit. Review prior matrices and failures to identify the boundary that matters, then preserve only the context needed to recognize the same risk earlier.

Keep the lesson for the next incident

  1. Compare repeated pairs

    Group episodes by component pair, contract, environment, queue, and release sequence. Distinguish expected overlap from pairs that repeatedly produce uncertain or harmful outcomes.

  2. Document the transition

    Record the intended compatibility window, participant identities, and evidence that demonstrates safe coexistence. Keep the statement conditional if compatibility was inferred rather than observed.

  3. Create a recognition rule

    Define a future review when an incompatible version pair reaches the same boundary or persists beyond its expected window. Name the reviewer and the records needed to decide quickly.

What to carry forward

The lesson should preserve one explicit compatibility boundary and a recurrence rule for version pairs outside it. Treat the rule as provisional until subsequent releases show that old workers, queues, and regions are included in review. Retain a compatibility matrix with served and intended versions, contract checks, and an explicit transition window so later releases can distinguish expected overlap from unreviewed skew.

Keep the decision with the work.

Use a Work Item in Aglet to record the problem, the evidence you have, and the next decision. Add an owner and priority, then keep updates in the discussion so the next person can follow the reasoning.

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