Nexalor
Long-form technical notes, written by operators for operators.
Reading Latency Percentiles Without Fooling Yourself
June 24, 2026
Mean latency figures obscure the critical tail behavior that quantile measurements highlight. An API exhibiting an average response time of fifty milliseconds can still subject five percent of requests to two-second delays; those unfortunate visitors encountering cold starts, cache misses, and saturated shards generate support complaints.
Evaluating quantiles requires understanding distributional nuances. Comparing 95th percentile metrics before and after releases is valid only when underlying traffic compositions remain unchanged; a surge in heavy reporting queries skews tail figures without representing true performance degradation. Similarly, evaluating 99th percentile numbers over narrow 60-second intervals captures fleeting noise rather than structural patterns.
Data Residency Basics for Global Teams
May 14, 2026
Compliance requirements concerning data residency typically surface late in development, casually framed around keeping regional information confined to a specific territory. That casual framing conceals significant complexity: geographic residency mandates architectural redesign rather than simply …
Structuring DNS for Reliability
August 8, 2026
Domain resolution outages produce an awkward paradox: server instances remain perfectly healthy while clients perceive complete downtime. Insulating against platform-level registrar outages demands secondary authoritative DNS providers operating over separate routing infrastructure.…
Understanding TLS 1.3 Session Resumption
July 10, 2026
Shortening the standard handshake to a solitary round trip was an achievement, but session resumption delivers the true speed advantage for returning traffic. Transmitting data right away via pre-shared keys spares high-latency cellular connections the drag of multi-step cryptographic exchanges.…
What Good Observability Actually Looks Like
May 28, 2026
Dashboards multiply like rabbits and answer questions nobody asked this month. Good observability starts from the opposite direction: the alert fired, a human is awake, and the tooling should answer 'what changed' within a minute.…
More reading
- A Field Guide to Graceful Degradation — Engineering, September 18, 2026
- Cache Invalidation Patterns That Survive Traffic — Data, September 15, 2026
- Practical Notes on Postgres Connection Pooling — Data, August 22, 2026
About us
We cover the unglamorous middle of software: queues that back up, caches that lie, and DNS at 3 a.m. Everything is written from real operational experience.