Metric
When developers monitor their applications and infrastructure to make sure things run smoothly, they set up metrics to track specific points of performance: how fast an API request gets fulfilled, the percentage of requests that fail, or even what % of total processing capacity is a server using up.
Unlike a log, which is a single line a computer emits when something happens, a metric is an aggregate of those things that happened rolled up into a useful number.

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What does Datadog do?
Datadog is monitoring software - developers use it to get operational visibility into their servers and applications.
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