mod_rewrite load average addon patch for Apache 2.2.19

Kolega Boris Pisarčík napísal jednoduchý patch do mod_rewrite Apache modulu umožňujúci URL rewrite v závislosti od “load average”, teda vytaženia samotného serveru. V prípade veľkého vyťaženia webového serveru je možné prestať prijímať ďalšie žiadosti, zobraziť používateľom statické HTML o preťažení a pokračovať v obsluhe hneď ako zaťaženie serveru poklesne. Patch je k dispozícii tu.

LOAD0 - system load average for last minute

LOAD1 - system load average for last 5 minutes

LOAD2 - system load average for last 15 minutes

Format of all the three is "nnnnnnn.dd", with 2 decimal numbers.

Example usage: rewrite php requests into custom static html in case system load for last 1 minute is greater than 4.0 to offload server from new requests.
RewriteCond %[LOAD0] !^[0-4]\..*

RewriteRule .* /static_branded_page.html [L]

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