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The primary operation metrics is easy to measure and already clearly defined.   Our proposed secondary operation metrics has not the immediate goal to create equal definitions for all light sources, but rather to encourage the publication of the statistics for these failure modes.   It'll need further discussion to evolve towards a standardized set of rules to calculate these secondary operation metrics; the web page \cite{Comi3glsUrl} is meant to inform about the ongoing discussion.  We are convinced that the proposed standard operation metrics will allow a much more meaningful comparison of the reliability of storage ring light sources than the current non-standardized statistics of "beam availability" beam availability  and "mean mean  time between failures". failures.