zhendongcmss commented on issue #5146:
URL: https://github.com/apache/apisix/issues/5146#issuecomment-927631140
> Maybe we can add:
>
> ```
> diff --git apisix/plugins/prometheus/exporter.lua
apisix/plugins/prometheus/exporter.lua
> index ea1c4843..4a8ec64e 100644
> --- apisix/plugins/prometheus/exporter.lua
> +++ apisix/plugins/prometheus/exporter.lua
> @@ -153,6 +153,10 @@ function _M.log(conf, ctx)
> metrics.latency:observe(upstream_latency,
> gen_arr("upstream", route_id, service_id, consumer_name,
balancer_ip))
> apisix_latency = apisix_latency - upstream_latency
> + if apisix_latency < 0 then
> + ngx.log(ngx.EMERG, "latency now ", ngx.now(), ", start_time:
", ngx.req.start_time(), ", upstream: ",
> + ctx.var.upstream_response_time)
> + end
> end
> metrics.latency:observe(apisix_latency,
> gen_arr("apisix", route_id, service_id, consumer_name,
balancer_ip))
> ```
>
> to see each value of the items.
ok, let me try.
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