feat(backend): MasterプロセスのPIDを書き出せるように #11909
Merged
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What
config.pidFileの設定に基づき、masterプロセスのPIDを書き出せるようにする。
#11734 の代替案でもある。
Why
systemdなどにおいてプロセスの生存確認、確実に停止したりすることなどに有用なため。
Checklist