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171 articles tagged with Monitoring.

Database Connection Pooling at Scale: PgBouncer, RDS Proxy, Application Pool

Three layers of pooling, three different jobs. We learned the hard way which to use when. Real numbers from a 8k-connection workload.

Kiril urbonas

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Cloudflare Workers vs Vercel Edge: A Latency-Cost Comparison

We deployed the same edge function on both platforms and measured for a quarter. Where each wins, where each loses, and the surprises along the way.

Kiril urbonas

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eBPF for SREs: Three Real Diagnoses That Saved Hours

We started using eBPF tooling for ad-hoc production debugging six months ago. Three real incidents where it cut investigation time from hours to minutes.

Kiril urbonas

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Argo Rollouts: Canary Deployments That Caught a $40k Bug

A two-line config change to an Argo Rollouts analysis template caught a regression that would have cost ~$40k in API spend before we noticed. Here's the pattern.

Kiril urbonas

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Linux Memory Management: When OOM Killer Strikes Your K8s Pods

Three production OOM incidents that taught us how kubelet, containerd, and the kernel actually decide which process dies. With debugging commands you'll wish you had earlier.

Kiril urbonas

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OpenTelemetry Collector Pipelines: Real Configs That Survived Production

We've been running the OTel Collector at the edge of every cluster for 18 months. The config patterns that lasted, the ones we ripped out, and a few processors that quietly saved us money.

Kiril urbonas

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Blue/Green Deploys for Stateful Services: A Postgres Cutover Story

Blue/green is easy for stateless services. We did it for our primary Postgres cluster with 3.2TB of data and ~8k connections. Here's exactly how — and what almost went wrong.

Kiril urbonas

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systemd Timers vs Cron: When We Switched and What We Learned

We migrated 47 cron jobs to systemd timers across our fleet. The mechanical conversion was easy. The interesting parts were the bugs we found that cron had been hiding.

Kiril urbonas

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Database Migrations Without Downtime: Patterns From Three Real Cutovers

How we shipped three schema migrations with zero customer impact. Expand-then-contract, dual-writes, and the rollback plan we never had to use — but tested anyway.

Kiril urbonas

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Monitoring That Actually Helps On-Call: Alerts, Dashboards, and Runbooks

We were drowning in 200 alerts a week. Most got ignored. After a quarter of triage and rework, we're at about 15 — and on-call actually responds to them.

Kiril urbonas

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Incident Postmortems That Actually Prevent Repeat Failures

We wrote pretty postmortems for two years and kept hitting the same incidents. Here's what changed when we started writing ugly ones.

Kiril urbonas

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Linux Performance Troubleshooting: A Real Incident Walkthrough

Step-by-step debugging of a production Linux server hitting 100% CPU. From top to perf to the actual fix.

Kiril urbonas

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