core RRD4J implementation.
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Creates new sample with the current timestamp and all data source values set to
'unknown'.
Creates new sample with the given timestamp and all datasource values set to
'unknown'.
Sets sample timestamp and data source values in a fashion similar to RRDTool.
Sets single datasource value using data source index.
Sets single data source value in the sample.
Sets some (possibly all) data source values in bulk.
(package private) final void