Counter
A counter is a cumulative metric that represents a single monotonically increasing counter, where the value can only increase, or be reset to zero on restart.
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Use a counter to represent the number of requests served, tasks completed, or errors.
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Do not use a counter to expose a value that can decrease. For example, do not use a counter for the number of currently running processes; instead use a gauge.
See the functions you can use with counter metrics.
