MongoDB perfmonitor.har collections grows too big

[leibowitz]

Using mongoDB default settings it will pre-allocate files for the collection which will double in size each time, ie 256M, 512M, 1024M, etc. eventually ending up generating huge files on the disk.

This method is normally used to improve performance but in this case can potentially make your server run out of space quickly, as the size of all the HAR files generated for each tests can end up being quite large

[leibowitz]

using capped collection is one solution, but would require storing the load time in a different collection (see milestone)

In the meantime you tweak MongoDB config, to use smallfiles for example

[leibowitz]

WIP in the db-timings branch to store data to a separate collection. This can cause issue when using a capped collection though, as it will mean the records in both collection won't have the same data.

To solve this issue it will be necessary to use a TTL collection instead where each record has a certain time expiry.