OpenTelemetry Metrics 101
summary
OpenTelemetry metrics are explained using a live telescopes demo app and the full metrics pipeline: API → SDK → metric reader → exporter → backend via OTLP and the collector. Concrete guidance covers the six instruments (six instruments: counter, up/down, async counter, async up/down, histogram, gauge), their default aggregations, temporality (cumulative vs delta), monotonicity, exemplars for trace correlation, cardinality risks, and views to remap aggregations or drop metrics. Each instrument’s use cases and when to prefer async reporting are shown.
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chapters (7)
- 0:00Introduction and background
- 1:53Metrics overview
- 6:11Why use metrics
- 10:29OpenTelemetry introduction
- 14:06Metrics pipeline architecture
- 23:54Metric instruments explained
- 37:49Views and closing thoughts
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