A couple hours after the second alarm, an announcement was broadcast over the speaker stating that a test of the fire alarm system would be conducted today, and to disregard further alarms. This was in fact the case as the fire alarm sounded intermittently for several hours (as it usually does during the annual fire alarm test).
Later in the day, the following notice of entry form was slipped into my mail slot. The notice says that a routine annual fire inspection will be conducted in the unit, tomorrow October 29 some time between 9 and 5.