zhendongcmss commented on issue #5146:
URL: https://github.com/apache/apisix/issues/5146#issuecomment-928933666
Facts proved `ngx.update_time()` doesn't work.
```
@@ -150,12 +150,17 @@ function _M.log(conf, ctx)
metrics.latency:observe(latency,
gen_arr("request", vars.status, method_id, route_id, service_id,
consumer_name, balancer_ip))
+ ngx.update_time()
local apisix_latency = latency
if ctx.var.upstream_response_time then
local upstream_latency = ctx.var.upstream_response_time * 1000
metrics.latency:observe(upstream_latency,
gen_arr("upstream", vars.status, method_id, route_id,
service_id, consumer_name, balancer_ip))
apisix_latency = apisix_latency - upstream_latency
+ if apisix_latency < 0 then
+ ngx.log(ngx.EMERG, "123456789","latency now ", ngx.now(), ",
start_time: ", ngx.req.start_time(), ", upstream: ",
+ ctx.var.upstream_response_time)
+ end
```
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