ConstReadonlyCONTEXT_The context identifier returned in the flag metadata uniquely identifies the subject of the flag evaluation. If not available, the targeting key should be used.
ReadonlyFLAG_A logical identifier for the flag set.
ReadonlyVERSION: "version"A version string (format unspecified) for the flag or flag set.
Well-known flag metadata attributes for telemetry events.