List a channel's out-of-service history
Channels
List a channel's out-of-service history
List the channel’s outage spans, most recently started first.
An open incident (resolved_at null) is the channel’s current outage;
at most one can exist. Rows with is_estimated true were reconstructed
from the channel’s last-modified time when outage history was introduced, so
their started_at is an upper bound rather than a recorded event.
List a channel's out-of-service history