What is the first step in diagnosing API failures for direct mail workflows?

Start with an API surface audit: check timeouts retry behavior and spikes in 4xx 5xx rates log failed requests for the top three callers record median and p95 latency for the last seven days count 401 and 403 events by client ID verify TLS and token lifetime and rotate keys older than 90 days enable distributed tracing to tie CRM events to print jobs and callbacks.

How do SLOs and error budgets help prioritize recovery work?

Set simple SLOs for uptime call success rate and end to end latency then track the error budget. Use the budget to decide when to throttle nonessential jobs and when to escalate fixes so limited engineering effort protects core flows first.

When should I use retries circuit breakers or an API gateway?

Deploy an API gateway or edge proxy to centralize auth rate limits and circuit breakers. Use short retries with exponential backoff plus strong idempotency keys for print job submissions and circuit breakers to avoid timeout cascades.

How can I ensure reliable callbacks from print vendors?

Require explicit delivery callbacks and a tracking ID store raw callback payloads for debugging for 30 days queue events locally and retry with backoff if callbacks fail and alert the owner after three failed attempts escalate and replay queued events if vendor callbacks remain unreliable.

What quick fixes work for common symptoms like timeouts auth failures and missing callbacks?

Timeouts: add short retries circuit breaker smaller payload batches and run a replay with idempotency keys on AWS Lambda. Auth failures: audit scopes rotate tokens and issue a short lived restricted key for recovery. Missing callbacks: queue and retry locally use fallback polling and replay queued events when possible.

How should rollback and failover be handled during an outage?

Follow a compact rollback plan: switch DNS to a backup gateway pause noncritical campaigns failover to a backup vendor if available and replay queued jobs. Investigate logs and roll forward hotfixes within the 1 to 24 hour window. Keep logs for 30 days.

How do I validate and replay missed print submissions without causing duplicate mailings?

Export an immutable campaign snapshot validate fields in Google Sheets or a CSV run a Python idempotent replay on AWS Lambda using idempotency keys monitor callbacks and only reroute jobs to a backup printer if callbacks still fail. This minimizes duplicates and protects customer trust.

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