diff --git a/metrology/collectd_exec_xmpp.sh b/metrology/collectd_exec_xmpp.sh
index 1f68a11..6ce0d5d 100755
--- a/metrology/collectd_exec_xmpp.sh
+++ b/metrology/collectd_exec_xmpp.sh
@@ -11,6 +11,7 @@ main() {
     while
         ejabberdctl_stats
         http_upload_disk_usage
+        captcha_stats
         #client_stats # XXX pas encore activée
         sleep "$INTERVAL"
     do true; done
@@ -33,6 +34,10 @@ http_upload_disk_usage() {
     echo "PUTVAL \"${HOSTNAME}/xmpp_upload_data_avg/count\" interval=$INTERVAL $(date +%s):${avg}"
 }
 
+captcha_stats() {
+    echo "PUTVAL \"${HOSTNAME}/xmpp_captcha_lastday/count\" interval=$INTERVAL $(date +%s):$(find /var/lib/ejabberd/chapril_captchas/ -mindepth 1 -maxdepth 1 -type f -mtime 1 | grep -v EXPERIMENTAL | wc -l)"
+}
+
 # XXX la syntaxe de la boucle while ci-dessous fait échouer le démarrage de collectd.
 # exec plugin: exec_read_one: error = /srv/xmpp.chapril.org/tools/metrology/collectd_exec_xmpp.sh: 44: /srv/xmpp.chapril.org/tools/metrology/collectd_exec_xmpp.sh: Syntax error: redirection unexpected
 #client_stats(){