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Risk LevelLikelyhood of service impactingPotential Downtime (if successful)Likelihood of unplanned outage extending maintenance windowExample
R1 100%More than 20 minsHighHardware upgrade
R270%More than 5 minsMediumReboot of server
R350%<5 minsMediumSignificant config change / restart of multiple services / change to a backup service
R420%< 10 secondsLowMinor config change and restart of a service
R55%None expectedLowUpdate to file