Month ago, 9 sep 2016 I import posts from phpbb3 and run nodebb in production. Three weeks later, 29 sep 2016 something strange happens, suddenly pageviews increase 4-5 times, but unique visitors leave at same level. I can't remember, but I think I did't install any plugins or make some changes.
CPU load also increase and now 20%-30% (DigitalOcean, 1CPU/512mb). But when I look at Google Analytics, nothing changed, still same amount sessions/users/pageviews.
Any ideas why? I can't say that my forum is popular now, only 1-2 topic/posts per day. I think its some web crowlers, but why its create so much load?
Some statistics:
Users 2,839 (>90% not active anymore)
Topics 7,051
Posts 116,061
Dashboard (unique visitors amount 900-5500):
