We have noticed that our MongoDB's are growing steadily. Which is an obvious result of just capturing all kinds of user interactions. However, we can't have the xDB grow infinitely...
I can't seem to find any config in Sitecore that provides the means to clean up on the collected MongoDB information, provide a TTL for xDB data or anything of that kind.
Furthermore, data is growing way faster than expected since a lot of bot analytics are also captured as the filtering done by ootb Sitecore is not sufficient.
Any general approaches or advice on how to handle this? Because we can hardly pitch this to our customers and inform them that the MongoDB size will keep increasing over time (or their subscription will). And old collected analytics data (older than 2years) is simply not relevant enough anymore. Or should become achievable.