Increasing prometheus shared memory space for metrics

Signed-off-by: Rajesh Rajendran <rjshrjndrn@gmail.com>

kubernetes/helm_charts/core/nginx-public-ingress/values.j2

@@ -756,7 +756,7 @@ nginxconfig: |
       access_log  /var/log/nginx/access.log  main;
 
       # Shared dictionary to store metrics
-      lua_shared_dict prometheus_metrics 10M;
+      lua_shared_dict prometheus_metrics 100M;
       lua_package_path "/etc/nginx/lua_modules/?.lua";
       # Defining metrics
       init_by_lua '