FIELD NOTES / 03

Working
playbooks.

Short materials for a review or an incident: a one-pager, a metrics pack, a drill script. These are not essays — they hold the working model, signals, and stop conditions.

One-pager
gRPC Deadlines and Retry Budgets Across a Service Chain
A one-page model for passing a shared deadline, keeping time for the caller, and capping retries without cascading load.
Go · gRPC · Distributed Systems

OBS PACK

Observability pack
PostgreSQL Connection Observability Pack for Kubernetes Rollouts
Metrics, dashboards, alerts, and checks that link a Kubernetes rollout to application pools and PostgreSQL connection exhaustion.
PostgreSQL · Kubernetes · Observability

FAILURE DRILL

Failure drill
Redis Failure Drill: Stop a Cache-Miss Stampede Before It Hits PostgreSQL
A safe drill: disable Redis in a bounded way, watch reads flood PostgreSQL, and verify shedding, warmup, and cache recovery.
Redis · PostgreSQL · Highload