[Bro] Bro cluster requirements and manager logging backlog bug

[Hovsep Levi]

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> [bro at mgr /opt/bro_data/logs/current]$ top -n -H -o time | grep bro
>  5672 bro        100   10 21076K  2796K RUN    19   6:35  62.79% gzip
>  5858 bro         95    5   510M   257M RUN     8   3:26  61.38% bro
>  5785 bro         95    5  2373M  2058M CPU11  11   3:20  59.08% bro
>  5743 bro         87    0  7897M  7743M RUN    14   3:19  52.78% bro{bro}
>  5743 bro         88    0  7897M  7743M CPU0    0   3:18  55.18% bro{bro}
>  5816 bro         40    0  5298M  1158M nanslp 23   1:59  23.29% bro{bro}
>  5743 bro         37    0  7897M  7743M uwait   4   1:32  23.58% bro{bro}
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Here are the associated mappings for the PIDs:

[bro at f01 /opt/bro]$ bin/broctl top manager logger
Name         Type    Host             Pid     Proc    VSize  Rss  Cpu   Cmd
logger       logger  169.231.234.36   5743    parent    9G     9G 194%  bro
logger       logger  169.231.234.36   5785    child     3G     2G  60%  bro
manager      manager 169.231.234.36   5858    child   510M   257M  63%  bro
manager      manager 169.231.234.36   5816    parent    5G     1G  18%  bro
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