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The authors are aware that successful user beam time depends on many factors, such as availability and dependability of the data acquisition system. Nevertheless the availability of photon beams with specified parameters on sample is the common prerequisite. This paper attempts to characterize significant quality and quantity losses to the available beam time in unambiguous ways, so they can be accounted for and compared. This is done from the perspective of a small number of very different light sources. If a number of facilities publish data according to this proposal, it would permit meaningful comparisons of reliability, a significant step forward. This is a first attempt to standardized definitions for operational reliability for storage ring light sources. For comprehensive analysis 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  brilliant and highly coherent X-ray beams for experiments.  This has the consequence that the requirements for orbit- and beam-current-stabilization   as well as for fluctuations in the beam size are getting tighter.  State-of-the-art operation metrics must take these conditions into account:  the performance requirements have to be strictly monitored and  all events where the facility fails to meet requirements  should be recorded, analyzed and published.  Storage ring light sources are simple to operate compared to Linac driven free-electron-lasers (FELs):  the number of operation modes is much smaller,