Add : to listen address

haproxy-osev3.yaml

@@ -52,7 +52,7 @@ objects:
           command:
           - /usr/local/sbin/haproxy_exporter
           - "--haproxy.scrape-uri=http://$(STATS_USERNAME):$(STATS_PASSWORD)@localhost:$(STATS_PORT)/?stats;csv"
-          - "--web.listen-address=$(SCRAPER_TCP_PORT)"
+          - "--web.listen-address=:$(SCRAPER_TCP_PORT)"
           resources: {}
           terminationMessagePath: /dev/termination-log
         - env: