المدربA metric is a named numeric measurement with labels, sampled or aggregated over time: a counter (messages received), a gauge (queue depth), a histogram (latency, as in Book 13, chapter 5). Structured logging writes each log event as a record of named fields — time, level, service, event, identifiers, values — rather than a sentence, so that logs can be queried like data.
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ما معنى Metric, structured logging؟
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