mongo
use kadiraData
db.getCollection('prodStats').remove({"time": {"$lte": new ISODate("2017-08-15T00:00:00.000Z")}})
db.getCollection('pubMetrics').remove({"_id.time": {"$lte": new ISODate("2017-10-15T00:00:00.000Z")}})
db.getCollection('pubTraces').remove({"startTime": {"$lte": new ISODate("2017-08-15T00:00:00.000Z")}})
db.getCollection('rawErrorMetrics').remove({"value.startTime": {"$lte": new ISODate("2017-08-15T00:00:00.000Z")}})
db.getCollection('rawMethodsMetrics').remove({"value.startTime": {"$lte": new ISODate("2017-08-15T00:00:00.000Z")}})
db.getCollection('rawPubMetrics').remove({"value.startTime": {"$lte": new ISODate("2017-08-15T00:00:00.000Z")}})
db.getCollection('rawSystemMetrics').remove({"value.startTime": {"$lte": new ISODate("2017-08-15T00:00:00.000Z")}})
db.getCollection('rmaLogs').remove({"startedAt": {"$lte": new ISODate("2017-08-15T00:00:00.000Z")}})
db.getCollection('systemMetrics').remove({"_id.time": {"$lte": new ISODate("2017-08-15T00:00:00.000Z")}})
Change the date to whatever you want. My instance normally gets sluggish after 2 weeks (running only 1 host) so I just run the above queries and has resolved it for me.