Close idle connections in influxdb outputs when reloading (#5912)

internal/http_go1.11.go

@@ -0,0 +1,15 @@
+// +build !go1.12
+
+package internal
+
+import "net/http"
+
+func CloseIdleConnections(c *http.Client) {
+	type closeIdler interface {
+		CloseIdleConnections()
+	}
+
+	if tr, ok := c.Transport.(closeIdler); ok {
+		tr.CloseIdleConnections()
+	}
+}

internal/http_go1.12.go

@@ -0,0 +1,9 @@
+// +build go1.12
+
+package internal
+
+import "net/http"
+
+func CloseIdleConnections(c *http.Client) {
+	c.CloseIdleConnections()
+}