rework loadbalancer support

integration/fixtures/healthcheck/multiple-entrypoints.toml

@@ -0,0 +1,33 @@
+[global]
+checkNewVersion = false
+sendAnonymousUsage = false
+
+[log]
+level = "DEBUG"
+
+[entryPoints]
+  [entryPoints.http1]
+    address = ":8000"
+  [entryPoints.http2]
+    address = ":9000"
+
+[api]
+
+[providers]
+   [providers.file]
+
+[http.routers]
+  [http.routers.router1]
+    service = "service1"
+    Rule = "Host(`test.localhost`)"
+
+[http.services]
+  [http.services.service1.loadbalancer]
+    [http.services.service1.loadbalancer.healthcheck]
+      path = "/health"
+      interval = "1s"
+      timeout = "0.9s"
+    [[http.services.service1.loadbalancer.servers]]
+      url = "http://{{.Server1}}:80"
+    [[http.services.service1.loadbalancer.servers]]
+      url = "http://{{.Server2}}:80"