THREESCALE-10571 fix(proxy*): set upstream metrics when sending request via proxy

[tkan145]

What

Fix THREESCALE-10571

Verification steps

• Checkout this branch
• Build new runtime-image

make runtime-image IMAGE_NAME=apicast-test

• Get into dev-environment

cd dev-environments/https-proxy-upstream-tlsv1.3

• Generate certs

make certs

• Modify the docker-compose file as followed

diff --git a/dev-environments/https-proxy-upstream-tlsv1.3/docker-compose.yml b/dev-environments/https-proxy-upstream-tlsv1.3/docker-compose.yml
index 25a49c52..f3ac3341 100644                                                                                                                 
--- a/dev-environments/https-proxy-upstream-tlsv1.3/docker-compose.yml                                                                          
+++ b/dev-environments/https-proxy-upstream-tlsv1.3/docker-compose.yml                                                                          
@@ -19,17 +19,19 @@ services:                                                                                                                   
     expose:                                                                                                                                    
       - "8080"
       - "8090"
+      - "9421"
     ports:                                                                                                                                     
       - "8080:8080"
       - "8090:8090"            
+      - "9421:9421" 
     volumes:                                                                                                                                   
       - ./apicast-config.json:/tmp/config.json                                                                                                 
   proxy:                                                                                                                                       
     build:                                                                                                                                     
       dockerfile: ./tinyproxy.Dockerfile                                                                                                       
     expose:                                                                                                                                    
-      - "3128:3128"
-      - "443:443"
+      - "3128"
+      - "443"  
     volumes:                                                                                                                                   
       - ./tinyproxy.conf:/etc/tinyproxy/tinyproxy.conf                                                                                         
   example.com: 

• Start the gateway

make gateway IMAGE_NAME=apicast-test

• Check metrics

curl --resolve get.example.com:9421:127.0.0.1 -v "http://get.example.com:9421/metrics" 

• Send a request

curl --resolve get.example.com:8080:127.0.0.1 -v "http://get.example.com:8080/?user_key=123"

• Check the metrics again, you should see

# TYPE upstream_status counter                                       
upstream_status{status="200",service_id="",service_system_name=""} 1

# HELP upstream_response_time_seconds Response times from upstream servers              
# TYPE upstream_response_time_seconds histogram                                         
upstream_response_time_seconds_bucket{service_id="",service_system_name="",le="0.05"} 1 
....