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-- header_filter_by_lua_block
ngx.header['X-Metrics-upstream_response_time'] = ngx.var.upstream_response_time
ngx.header['X-Metrics-upstream_connect_time'] = ngx.var.upstream_connect_time
ngx.header['X-Metrics-request_time'] = ngx.var.request_time
ngx.header['X-Metrics-tcpinfo_rtt'] = ngx.var.tcpinfo_rtt
ngx.header['X-Metrics-time_iso8601'] = ngx.var.time_iso8601
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