A service starts adding the label `environment='prod'` to a metric that previously had no `environment` label. What happens in Prometheus?

AThe existing series is updated in place with no identity change

BThe scrape is rejected because labels cannot be added later

CA new time series is created because the label set changed

DOnly recording rules see the new label

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A service starts adding the label environment='prod' to a metric that previously had no environment label. What happens in Prometheus?

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A service starts adding the label `environment='prod'` to a metric that previously had no `environment` label. What happens in Prometheus?