# Functions
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NewPrometheusReader is the PrometheusReader constructor.
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ReadProgressFile reads the progress file in the given directory and returns the saved offset.
SaveProgressFile saves a progress file with the given offset in directory.
# Structs
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SizedMetric encapsulates a small number of points w/ precomputed approximate size.
# Interfaces
Appender appends a time series with exactly one data point.
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