I've fermented a 5 gallon lager at 45°F(7°C) for 2 weeks. The OG 1.050 and FG 1.012. At this point, I racked to secondary and put back in the airlock & bung. Increasing temperature to 65°F(18°C) for 2 days. I plan to lower gradually in secondary 5°F(2.5°C) per day until reaching 35°F(2°C) or so for lagering several weeks.
1) Will I notice any airlock activity during diacetyl rest? How else to determine diacetyl rest is occurring?
2) Will I remove airlock during lagering and keep airtight with bung so no air escapes?