pkg/process: remove prometheus help (#2914)

the current prometheus help messages have enough unexpected
characters that they are breaking prometheus parsing. they
may also be triggering prometheus to expect more from us (type
annotations) than we have to offer.

we're really not adding a lot of value with these help messages,
so just take them out

Change-Id: I9b723447a294bb492a6292480e9f88634346a80b

pkg/process/debug.go

@@ -84,8 +84,6 @@ func prometheus(w http.ResponseWriter, r *http.Request) {
 	// (https://prometheus.io/docs/concepts/metric_types/)
 	monkit.Default.Stats(func(name string, val float64) {
 		metric := sanitize(name)
-		_, _ = fmt.Fprintf(w, "# HELP %s %s\n%s %g\n",
-			metric, strings.ReplaceAll(name, "\n", " "),
-			metric, val)
+		_, _ = fmt.Fprintf(w, "%s %g\n", metric, val)
 	})
 }