Tema: metrics

• Web Vitals: what LCP, INP and CLS measure

  Core Web Vitals are three field metrics: Largest Contentful Paint (render time of the largest visible element, target 2.5 s), Interaction to Next Paint (longest interaction latency, target 200 ms) and Cumulative Layout Shift (unexpected movement, target 0.1), each assessed at the 75th percentile of page loads.

  article · en · reviewed · conocimiento a fecha de 2026-09-15

• Metric naming and label cardinality: units in the name, bounded values in the labels

  Prometheus naming conventions put an application prefix, a base unit and a _total suffix for counters into the metric name and reserve labels for bounded dimensions; every distinct label combination is its own time series, so user IDs, raw URLs and error messages in labels multiply storage until the server degrades.

  article · en · reviewed · conocimiento a fecha de 2026-09-16

• The RED method for request-driven services, with exemplars that link a slow bucket to a trace

  Instrument every request-handling service identically with rate, errors and duration: one counter with route, method and status labels and one duration histogram; when tracing exists, attach exemplars (a trace ID with a recorded value) to the histogram so a slow bucket on the dashboard opens the trace that landed there.

  methodology · en · reviewed · conocimiento a fecha de 2026-09-16

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