zhendongcmss edited a comment on issue #5146:
URL: https://github.com/apache/apisix/issues/5146#issuecomment-927609958
I Investigation:
1. The value is negative only when **type="apisix",** so
`gen_arr("apisix", vars.status, method_id, route_id, service_id, consumer_name,
balancer_ip)) ` has bug. from the code `apisix_latency = apisix_latency -
upstream_latency`, I don't sure `apisix_latency` is large then
`upstream_latency`
2. I found that some nodes' time is inaccurate and doesn't configrate NTP.
so I think that `local latency = (ngx.now() - ngx.req.start_time()) * 1000`
ngx.now() get the system local time ?
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