Json Nginx Logging

nginx-json-log.conf

map $msec $millis { ~(.*)\.(.*) $2; }
map $time_iso8601 $time_iso8601_m { ~(.*)\+(.*) $1.$millis+$2; }

log_format json_combined escape=json
  '{'
   '"_ms": "$millis",' # Has to be here in order for timestamp to work. Wat
    '"timestamp": "$time_iso8601_m",'
    '"service": "sp-frontend",'
    '"remote_addr":"$remote_addr",'
    '"message":"[$status] $request_method $request_uri",'
    '"method": "$request_method",'
    '"status": $status,'
    '"sent_length":$body_bytes_sent,'
    '"duration_s":$request_time,'
    '"referrer":"$http_referer",'
    '"user_agent":"$http_user_agent",'
    '"level": "info",'
    '"proto": "$server_protocol",'
    '"url": "$request_uri"'
  '}';