migration

Sets instead of thousand-rule chains, one engine for both IP families, atomic ruleset swaps, and a compatibility shim with sharp edges. Migration risk lives in coexistence and tooling assumptions, not syntax.

The services-and-enterprise interview staple. There is a defensible answer and it is not 'always re-platform': the decision is a function of change tolerance, deadline reality and what the workload is worth.

The services-market question that decides who can actually run a migration. Import is the easy part; the hard parts are resource-for-resource fidelity and proving the first plan is empty.

An end-of-maintenance date changes the risk even while traffic stays healthy. The work is proving routing and security parity before moving a production hostname.

Sequence a compatible column migration, reconcile concurrent writes, and identify when returning to the old application starts requiring data repair.

OpenTelemetry is an API and a wire protocol, not a product. Candidates who promise instant multi-vendor bliss have never run the collector in production or negotiated with a vendor who knows it.

The migration question, and the trap is answering with a target architecture. What is being scored is sequencing: how you get there without a rewrite and without a release freeze.

Sharding buys write headroom and bills you in joins, foreign keys, and every future migration. The key choice is a query-pattern bet; the resharding choreography separates operators from diagram artists.

Turning on strict mTLS across two hundred services in one change breaks everything that talks to something outside the mesh. Permissive mode exists so the migration can be observed instead of guessed at.

Announcing a deadline is not a migration plan. The teams that miss it are the ones who were never going to read the announcement.

A generated template is a copy, not a link. Drift is not a discipline failure, it is the predictable result of the mechanism you chose.

Each team is behaving rationally. The cost of migrating is theirs, immediate and certain; the benefit is later and uncertain. That asymmetry does not resolve by being explained again.

Retire an internal tool through verified user needs, compatibility evidence and an owned cutover, while treating its maintainer as a source of context rather than a barrier.

Define the shared operating requirements before standardizing delivery, then test representative migrations and keep supported exceptions explicit.