最近リリースされた Hatena::Let (ラボ) や、1年ぐらい前にリリースしたはてなコピィ (ラボ) は PSGI を喋るように対応した Ridge (はてな社内フレームワーク) を使っています。 (過程で Plack を利用させてもらっています)。今のところは現状それぞれ、let は Starman, copie は mod_perl2 で動いています (copie も mod_perl2 でなくす予定です)。
cho45 works for Hatena and there they converted their web framework Ridge to run on PSGI (nice).
For the operation/monitoring purpose they need something similar to Apache's mod_status to see which workers is handling which URLs. He added that feature to Starman and Starlet, so the output of ps can show the status and requests in the terminal. He also hacked up Plack middleware for ServerStatus which shows mod_status like HTML in /server-status
URL.
All of these look great - I'll take a look at them to see if it's possible to merge them down.
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