ReadonlylimitRequests allowed per window, or null if the server did not say.
ReadonlyobservedA monotonic reading (milliseconds) from when this was read, so reset
can be aged. NOT an epoch timestamp: it is not meaningful as a date, and
new Date(observedAt) is nonsense. The Python sibling's observed_at is
the same idea in seconds.
ReadonlypolicyThe raw policy string, e.g. "300;w=60".
ReadonlyremainingRequests left in the current window, or null if the server did not say.
ReadonlyresetSeconds until the window resets, as of observedAt.
One meter's state, as of the last response that mentioned it.