Cpu spike for every 4 hours

Thank you so much for the response,

  1. db.collections.countDocuments() gave me 50.
  2. db.chunks.countDocuments() gave me 7775
  3. db.tags.countDocuments() gave me 0 and all these I’ve extracted from mongos(router) and db is config.

So far I remember, We have not altered any of the default configurations and no backup is also scheduled.
And Yes, I’ve see the growth in connections during the spike but the growth is <5 it seems.

Thanks in Advance!
Vaseem