dashboard, p2p, vendor: visualize peers (#19247)

* dashboard, p2p: visualize peers

* dashboard: change scale to green to red

vendor/github.com/oschwald/maxminddb-golang/reader_appengine.go

@@ -0,0 +1,28 @@
+// +build appengine
+
+package maxminddb
+
+import "io/ioutil"
+
+// Open takes a string path to a MaxMind DB file and returns a Reader
+// structure or an error. The database file is opened using a memory map,
+// except on Google App Engine where mmap is not supported; there the database
+// is loaded into memory. Use the Close method on the Reader object to return
+// the resources to the system.
+func Open(file string) (*Reader, error) {
+	bytes, err := ioutil.ReadFile(file)
+	if err != nil {
+		return nil, err
+	}
+
+	return FromBytes(bytes)
+}
+
+// Close unmaps the database file from virtual memory and returns the
+// resources to the system. If called on a Reader opened using FromBytes
+// or Open on Google App Engine, this method sets the underlying buffer
+// to nil, returning the resources to the system.
+func (r *Reader) Close() error {
+	r.buffer = nil
+	return nil
+}