[GitHub] [apisix] zhendongcmss edited a comment on issue #5146: bug: Prometheus plugin metrics http latency sum is negative

Wed, 29 Sep 2021 04:39:02 -0700 


zhendongcmss edited a comment 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
   ```
   
![image](https://user-images.githubusercontent.com/88528414/135261177-94e2fea6-2813-4b36-b516-13fea965b10b.png)
   
   
   
   
   
   


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