[7.x] Experimental self-profiling (#2839) #3037
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* vendor: add github.com/google/pprof/profile * model/profile: add profile data model * config: config for profiling the server * beater: add profiling endpoint * vendor: add github.com/OneOfOne/xxhash Already being used by Beats. * model: fix fields * beater/api/profile: address review comments * beater/config: split InstrumentationConfig out * decoder: add LimitedReader * beater/api/profile: use decoder.LimitedReader * Add integration test * idxmgmt: add "profile" event index * tests/system: add system tests for profiling * model/profile: remove profile.id Not needed for now, and will get in the way of storage optimisations (aggregating multiple profiles) later.
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Backports the following commits to 7.x: