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#observability

Gaining deep insights into system behavior through metrics, logs, and traces.

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Replay One Span, Not the Whole Run

Replay One Span, Not the Whole Run

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5 min read
Node.js SaaS Structured JSON Logs (Attributing Cost Without User PII)

Node.js SaaS Structured JSON Logs (Attributing Cost Without User PII)

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7 min read
The Token Leader Is Not the Latency Leader: Build a Span Ledger for Agent Runs

The Token Leader Is Not the Latency Leader: Build a Span Ledger for Agent Runs

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7 min read
Gate Jobs on Tokens per Accepted Artifact Before Retries Eat the Budget

Gate Jobs on Tokens per Accepted Artifact Before Retries Eat the Budget

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6 min read
My short-link stats API learned that 'is it dead?' is a different question than 'is it alive?'

My short-link stats API learned that 'is it dead?' is a different question than 'is it alive?'

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2 min read
Node.js Percentage Feature Flags — 3 Stable Backend Rollout Signals

Node.js Percentage Feature Flags — 3 Stable Backend Rollout Signals

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6 min read
48-Hour Field Notes: My p95 Looked Healthy Because I Averaged Four Percentiles

48-Hour Field Notes: My p95 Looked Healthy Because I Averaged Four Percentiles

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7 min read
Video Room Participant Identity and Join Admission Explained for Property Managers

Video Room Participant Identity and Join Admission Explained for Property Managers

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5 min read
Express Error Tracking Explained — Pino and Winston Integration for Rollback Evidence

Express Error Tracking Explained — Pino and Winston Integration for Rollback Evidence

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5 min read
How to Moderate Video Room Participants by Muting or Kicking (During Live Polls)

How to Moderate Video Room Participants by Muting or Kicking (During Live Polls)

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5 min read
Checkout Failure Alerting: Polling Logs and Error APIs for Failed Jobs and 5xx Exceptions

Checkout Failure Alerting: Polling Logs and Error APIs for Failed Jobs and 5xx Exceptions

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8 min read
Counting OpenAI Tokens per Request in FastAPI — Without Touching My Use Cases

Counting OpenAI Tokens per Request in FastAPI — Without Touching My Use Cases

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6 min read
Node.js Video Rooms: Presence-Accurate Event Delivery With Transport Fallback

Node.js Video Rooms: Presence-Accurate Event Delivery With Transport Fallback

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6 min read
A zero with no witness is a rumor with a chart

A zero with no witness is a rumor with a chart

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2 min read
Node.js Channel Indicators: A 2-Second Typing Lease Worth the Chatter

Node.js Channel Indicators: A 2-Second Typing Lease Worth the Chatter

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5 min read
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