Limit the number of extrapolations on the service load timeseries in legacy autoscaling signalflow.
Limit the number of extrapolations on the service load timeseries in legacy autoscaling signalflow.

Without this, when instances die we'll keep the service load timeseries (e.g. uwsgi) pegged at its last value for some time.

See PAASTA-17043 for details.

Yelp/paasta,Yelp/paasta