# M12 — structured HTTP performance log format.
# Install into /etc/nginx/conf.d/ (already included from nginx.conf http {}).
# Do not replace the existing combined access log.
# Activate with a second access_log on the Skinbase server block.
#
# Variables validated against nginx/1.26.3 on server3.
# $uri is used (not $request_uri) so query strings are not logged.
# No $remote_addr, cookies, or Authorization.

log_format skinbase_perf escape=json
    '{"time":"$time_iso8601",'
    '"host":"$host",'
    '"method":"$request_method",'
    '"uri":"$uri",'
    '"status":$status,'
    '"request_time":$request_time,'
    '"upstream_response_time":"$upstream_response_time",'
    '"upstream_connect_time":"$upstream_connect_time",'
    '"upstream_header_time":"$upstream_header_time",'
    '"bytes":$body_bytes_sent,'
    '"request_length":$request_length,'
    '"content_type":"$sent_http_content_type",'
    '"cache":"$upstream_cache_status"}';