time_window priority in alert.py

self.time_window 's value should be `interval_to_graphite(options.get('time_window', self.reactor.options.get('time_window', self.interval)))` in `alert.py`, or the time_window option is useless in the configuration's main block

Open alert.py and inspect how self.time_window is assigned, especially the fallback to reactor options and the interval value. Update the handling so the main configuration block's time_window is honored, then verify that the resulting value is passed through interval_to_graphite as described in the issue.

Written by the indexing model from the issue text.