Fix “Durable Object reset because its code was updated”
Why a deploy makes Cloudflare Durable Objects throw “reset because its code was updated”, and how to retry safely, keep clients connected and lose no state.
Boris Tane Learn how to run production. Plain answers to the questions on-call engineers ask.
Boris Tane More guides
Fix Cloudflare “Error 1102: Worker exceeded resource limits”
Why a Cloudflare Worker returns Error 1102, how to tell a CPU time overrun from a 128 MB memory overrun, and the code and Wrangler changes that fix each.
Boris Tane Kubernetes CrashLoopBackOff: causes and fixes
What CrashLoopBackOff means in Kubernetes, how to read the exit code and events behind it, and the fix for each common cause, from bad config to failing probes.
Boris Tane Kubernetes OOMKilled (exit code 137): causes and fixes
Why Kubernetes reports OOMKilled with exit code 137, how to tell a limit kill from a node eviction or a plain SIGKILL, and how to size memory so it stops.
Boris Tane Fix “remaining connection slots are reserved” in PostgreSQL
Why Postgres refuses new logins with “remaining connection slots are reserved”, how to find who holds the connections, and how to pool and cap them for good.
Boris Tane Fix Prisma “P1001: Can't reach database server”
Why Prisma prints “P1001: Can't reach database server”, how to test the host and port it names, and how to fix private hosts, IPv6, paused databases and URLs.
Boris Tane Fix Railway “Application failed to respond” (502)
Why Railway returns “Application failed to respond” with a 502, how to tell a wrong host, port or target port from a crash or overload, and how to fix each.
Boris Tane Fix Render “Port scan timeout reached, no open ports detected”
Why a Render deploy fails with “Port scan timeout reached, no open ports detected”, how to spot the cause in the logs, and how to bind to 0.0.0.0 on PORT.
Boris Tane Fix Vercel “FUNCTION_INVOCATION_FAILED” 500 errors
Why a Vercel Function returns 500 FUNCTION_INVOCATION_FAILED, how to find the crash in runtime logs, and how to fix throws, missing env vars, files and memory.
Boris Tane Fix Vercel “MIDDLEWARE_INVOCATION_FAILED” errors
Why Vercel returns 500 MIDDLEWARE_INVOCATION_FAILED or EDGE_FUNCTION_INVOCATION_FAILED, how to find the failing middleware in logs, and how to fix it.
Boris Tane Amazon Bedrock Managed Agents (OpenAI preview): setup and limits
Amazon Bedrock Managed Agents, powered by OpenAI, entered preview on 29 Sep 2026. What it is, how to run a first session, and the preview limits to plan for.
Boris Tane How to group noisy alerts into one incident
Group noisy alerts into one incident: pick grouping labels, set group_by and timers, inhibit downstream symptoms and key incidents on the group key.
Boris Tane Cloudflare Containers agent sandboxes: startup and setup
Cloudflare Containers now start agent sandboxes in a median 648 ms. Set up the durable_object policy, runtime images and snapshots, and know the limits.
Boris Tane How to attach Vercel Sandbox to a Secure Compute network
Vercel Sandbox now supports Secure Compute. Attach a sandbox to your network for static egress IPs and VPC peering, with steps, costs and gotchas.
Boris Tane Workers Issues: route Cloudflare errors to coding agents
Cloudflare's new Workers Issues groups exceptions and 5xx errors and sends them to Claude Code, Cursor, Devin or a webhook. Setup, automations and limits.
Boris Tane Cloudflare Basin: a guide to the serverless data platform
Cloudflare Basin went GA on 1 October 2026. What its pipelines, Iceberg catalogue and SQL engine do, how to set it up, and the limits to plan for.
Boris Tane Cloudflare Durable Objects pending I/O keep-alive guide
From 2026-10-01, pending I/O keeps Cloudflare Durable Objects in memory after the client leaves. What counts, the 15-minute limit, flags and billing.
Boris Tane Cloudflare K2: how to adopt serverless event streams
Cloudflare K2, announced 1 October 2026, is a serverless event stream on R2. What it is, how it differs from Queues, setup steps and beta limits.
Boris Tane Modal Clusters: multi-node GPUs and RDMA, step by step
Modal Clusters went GA on 1 October 2026. How @modal.clustered and rdma=True work, how to run torchrun or Ray across nodes, and the limits to plan for.
Boris Tane Fix “context deadline exceeded” in Docker and fly deploy
What “context deadline exceeded” means in Docker and fly deploy, how to find the call that timed out, and the fixes for WireGuard, builders and daemons.
Boris Tane Fix “error umounting /data: EBUSY” on Fly.io Machines
Why Fly.io logs “error umounting /data: EBUSY: Device or resource busy” at shutdown, how to find what stopped the Machine, and how to keep it running.
Boris Tane How to debug Vercel function timeouts
Debug Vercel FUNCTION_INVOCATION_TIMEOUT 504s: find the slow call with vercel logs and httpstat, fix hangs, set maxDuration and verify on a preview.
Boris Tane How to keep AI coding agents from breaking production
Stop AI coding agents breaking production: scoped credentials, branch protection they can't bypass, required checks that block, and production-aware review.
Boris Tane How to Use Claude Code to Debug Production Issues
Debug production issues with Claude Code: get logs and traces into the session, test hypotheses against evidence, stay read-only and ship a verified fix.
Boris Tane How to Monitor a Convex App in Production
Monitor a Convex app in production: use the Health page and CLI, stream logs to Axiom or Datadog, report exceptions to Sentry, and alert on failures.
Boris Tane How to Monitor a Django App on Render
Monitor a Django app on Render: JSON logs, a real health check, failure alerts, log and metrics streams, OpenTelemetry under Gunicorn and Celery checks.
Boris Tane How to Monitor a Supabase App in Production
Monitor a Supabase app in production: scrape the Metrics API into Prometheus, drain logs, run SQL health checks, trace requests and alert on what matters.
Boris Tane How to monitor a vibe-coded app in production
Monitor a vibe-coded app in production: surface swallowed errors, add a health route, tag deploys, watch cron jobs and alert on what users feel first.
Boris Tane Cloudflare Hyperdrive connection errors: causes and fixes
Fix Cloudflare Hyperdrive connection errors: config codes 2008 to 2016, pool exhaustion, connection_refused and stale clients reused across Worker requests.
Boris Tane Cloudflare Workers error 1101: causes and how to fix it
Error 1101 means your Cloudflare Worker threw an uncaught JavaScript exception. Find the exception in logs, match it to its cause, fix it and roll back fast.
Boris Tane Vercel 504 Gateway Timeout on Serverless Functions: Causes and Fixes
Fix Vercel 504 FUNCTION_INVOCATION_TIMEOUT errors: current duration limits, how to find the slow call, the fix for each cause and how to raise maxDuration.
Boris Tane Is It Safe to Give an AI SRE Read Access to Production?
Read access for an AI SRE is a sound first step if you scope it. The risks are secrets, customer data and exfiltration. Here are the controls and a checklist.
Boris Tane What Is an AI SRE? How It Works and How to Evaluate One
An AI SRE is an AI agent that triages alerts, investigates incidents and proposes fixes. Learn how it works, the autonomy levels and how to evaluate one.
Boris Tane How to Monitor a FastAPI App on Railway: Logs, Traces and Alerts
Set up health checks, JSON logs, OpenTelemetry traces, monitors and crash alerts for a FastAPI service on Railway, with the commands and config to copy.
Boris Tane How to Debug Cloudflare Workers Errors: Logs, Traces and Error Codes
Debug Cloudflare Workers errors step by step: read 1101 and 1102 codes, enable Workers Logs and source maps, use wrangler tail, DevTools and local traces.
Boris Tane Browse by topic
Alert triage 1 guide How to sort, group and route alerts so the right person sees each one, and how to cut the pages that wake people up for nothing. Deployment safety 2 guides How to ship changes safely: canary releases, change tracking, and what to check before and after every deploy reaches production. Monitoring coverage 6 guides How to find the gaps in your monitoring: which services have no alerts, which signals are missing, and what to add first to close them. Incident response 2 guides How to run an incident from the first page to the fix: triage, root cause analysis, keeping people informed, and the follow-up after. Reliability 3 guides How to set SLOs and error budgets, measure uptime honestly, and plan for the failures every production system has. Troubleshooting 17 guides Step-by-step fixes for common production errors on AWS, Kubernetes, Cloudflare, Vercel, Postgres and the rest of a modern stack. AI in production 4 guides How to give coding agents production context, connect them over MCP, and let AI change live systems with the right guardrails.