OpenResty: record the Lua execution time per request in ngx.ctx via LD_PRELOAD

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TL;DR How can I log the Lua execution time of each request (excluding time spent on asynchronous IO) in ngx.ctx in a non-intrusive, zero-cost way? The Lua execution time is the sum of the following metrics: lua_resume phases REWRITE ACCESS CONTENT BALANCER lua_pcall filters header_filter body_filter https://github.

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