[Dynatrace] debug log in exporter when no meters are registered #4951
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Adds a debug log for when no meters are passed to
DynatraceExporterV2#export()
and returns early as any code after this is a no-op.Currently, when no meters are passed to export, we don't send any requests nor do we do any other operations that would indicate that the exporter being called on any log-level, thus making it harder for users and/or support engineers to diagnose this trivial case.
cc @pirgeo