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This PR fixes three things:
The default interval of 5 seconds is a nice to have, but it breaks large systems. Collecting and sending all this information on a 2000 OSD cluster is killing for the Manager. We shouldn't set that by default.
In addition a optimization here is to only fetch the time once, store it in a variable and us it in that run. Otherwise values have different times, but we also perform a lot of syscalls for fetching the time.
The last fix is to set a default retention of 8 weeks in InfluxDB. Users can change this however they like, it will not be modified afterwards, but it's to prevent users setting this up and having a DB grow for ever and breaking at some point in the future.