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Start with the catalog: it is the source of truth for metric names, units, supported scopes, aggregations, and grouping dimensions.
Queries accept between one and ten supported metric names. Use a narrow time range for drill-down, then widen it for trends. Project charts correlate deployment annotations; dense deployment windows are grouped so events remain usable instead of covering the signal. Metric values come from the selected resource scope and are never substituted with sample data. See the Metrics API.