Add ability to write capture stats to a file. #155
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With -s, periodically fetch capture stats from the inspector and write them to the provided file. Separate class StatsFileWriter handles the details. It does rely on a timer + SIGALRM handler so you can only practically create a single object, but it does keep the code/state separate. The output format has a sample number, the set of current stats, a delta with the difference from the prior sample, and the percentage of events dropped during that sample.
When run via scripts like run_performance_tests.sh, it's useful to include extra info like the test being run and the specific program variant to the stats file. So support that via the environment. Environment keys starting with FALCO_STATS_EXTRA_XXX will have the XXX and environment value added to the stats file. It's undocumented as I doubt other programs will need this functionality and it keeps the docs simpler.
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With -s, periodically fetch capture stats from the inspector and write
them to the provided file.
Separate class StatsFileWriter handles the details. It does rely on a
timer + SIGALRM handler so you can only practically create a single
object, but it does keep the code/state separate.
The output format has a sample number, the set of current stats, and a
delta with the difference from the prior sample.