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is occurring at a facility, a specific failure mode for this type   should be recorded and published.  The authors are aware that there successful user beam time depends on many factors, e.g. availability, dependability, etc. of the data taking environment. Nevertheless the availability of photons of promised property and quantity on sample  is currently no mechanism to enforce a the  common operation metrics.  It and unique prerequisite. This paper  isunlikely that a large number of facilities will adapt  the common operation metrics   in attempt to characterize significant quality and quantity losses to  the near future available beam time in an unambigous way, so it can be accounted  for and compared. This is done from  the publication perspective  oftheir operation failures.  But even if just  a small number of very different light sources. If a number of  facilities would publish their failure data according to this proposal, it would at least allow a meaningful comparison of the reliability of those facilities. And that would be already a significant step forward compared to the current situation. It is the first attempt to find a standardized definition of an operation reliability for storage ring light sources, at least to the knowledge of the authors. Certainly specifics of operational modes and resulting failures and their severity have to be completed for every facility.  The performance of storage ring light sources has been increasing for the past decades.  Diffraction limited light sources aim now to provide extremely