nginx.conf.yaml

apiVersion: v1
data:
  default.conf: |-
    client_body_buffer_size     10M;
    client_max_body_size        10M;

    lua_shared_dict prometheus_metrics 50M;
    lua_package_path "/opt/nginx-lua-prometheus/?.lua";
    init_by_lua '
      prometheus = require("prometheus").init("prometheus_metrics")
      metric_requests = prometheus:counter(
        "nginx_http_requests_total", "Number of HTTP requests", {"status"})
      metric_requests_controller = prometheus:counter(
        "nginx_http_requests_controller", "Number of HTTP requests", {"status", "controller"})
      metric_latency = prometheus:histogram(
        "nginx_http_request_duration_seconds", "HTTP request latency", {})
      metric_connections = prometheus:gauge(
        "nginx_http_connections", "Number of HTTP connections", {"state"})
    ';

    server {
        listen       80;
        server_name  localhost;

        #charset koi8-r;
        #access_log  /var/log/nginx/access.log main buffer=1k;
        access_log off;
        error_log  /var/log/nginx/error.log notice;

        log_by_lua '
          local backend = ngx.var.http_backend
          if (backend == nil or backend == "") then
            backend = "default"
          end
          metric_requests:inc(1, {ngx.var.status})
          metric_requests_controller:inc(1, {ngx.var.status, backend})
          metric_latency:observe(tonumber(ngx.var.request_time), {})
        ';

        location / {
            proxy_pass  http://dis-ingestion.metrics.svc.cluster.local:9090;
        }
    }

    # Server for prometheus scraper.
    server {
      listen 9145;
      access_log off;
      location /metrics {
        content_by_lua '
          metric_connections:set(ngx.var.connections_reading, {"reading"})
          metric_connections:set(ngx.var.connections_waiting, {"waiting"})
          metric_connections:set(ngx.var.connections_writing, {"writing"})
          prometheus:collect()
        ';
      }
    }