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Observability & OpenTelemetry

Logs, metrics, traces, and the OpenTelemetry ecosystem: instrumentation, the OTel SDK/Collector, distributed tracing, Prometheus/Grafana, SLI/SLO/SLA, sampling strategies, and Node.js OTel setup.

Observability & OpenTelemetry

Observability vs monitoring

The three pillars of observability

Structured logging

Log levels

What is a span?

W3C TraceContext header

SLI, SLO, and SLA

Correlation IDs

OpenTelemetry architecture

Node.js OTel SDK setup

Auto vs manual instrumentation

OTel metric instrument types

Trace sampling strategies

Prometheus & Grafana

Jaeger vs Zipkin vs Grafana Tempo

Context propagation

Cardinality in metrics

Tail-based sampling implementation

Error tracking with Sentry and OTel

Alerting best practices

OTel Collector pipeline design