Add a --no-metrics flag to prevent writing a node-exporter snippet

runcron.c

@@ -48,6 +48,7 @@ int log_to_syslog = 1;
 int locking = 1;
 int lock_timeout = 0;
 int lock_wait = 0;
+int do_export_metrics = 1;
 
 char *lock_dir = "/var/lock";
 char *log_tag;
@@ -683,6 +684,7 @@ int main(int argc, char **argv) {
         {"lock-dir", required_argument, 0, 0},
         {"wait", no_argument, &lock_wait, 1},
         {"node-exporter-dir", required_argument, 0, 0},
+        {"no-metrics", no_argument, &do_export_metrics, 0},
         // Legacy
         {"quiet", no_argument, 0, 'q'},
         {0, 0, 0, 0}};
@@ -782,7 +784,7 @@ int main(int argc, char **argv) {
   }
 
   r = run(argv + optind);
-  if (prometheus_node_exporter_enabled()) {
+  if (do_export_metrics && prometheus_node_exporter_enabled()) {
     export_metrics(r);
   }