The only metric that matters and one streamers keep tight lipped about, is how many people viewed the show. Reports are that Citadel had very strong viewership numbers.
The metrics they really care about are growth and retention. Viewership is only an imperfect proxy for those. Conceivably millions of people turn on a highly hyped program but end up hating it, don't recommend it, and cancel their subs. So it really does matter if people aren't happy with the content they consume.
The Netflix numbers were based on hours viewed per season globally. It was not broken out per episode or anything more granular. Would be curious to know exactly how they count everything and make sure that views don't get lost.