diff --git a/metrology/collectd_exec_xmpp.sh b/metrology/collectd_exec_xmpp.sh
index 7e8afb4..a69350a 100755
--- a/metrology/collectd_exec_xmpp.sh
+++ b/metrology/collectd_exec_xmpp.sh
@@ -24,6 +24,8 @@ ejabberdctl_stats() {
     echo "PUTVAL \"${HOSTNAME}/xmpp_s2s_in/count\" interval=$INTERVAL $(date +%s):$(ejabberdctl incoming_s2s_number)"
     echo "PUTVAL \"${HOSTNAME}/xmpp_s2s_out/count\" interval=$INTERVAL $(date +%s):$(ejabberdctl outgoing_s2s_number)"
     echo "PUTVAL \"${HOSTNAME}/xmpp_muc_total/count\" interval=$INTERVAL $(date +%s):$(ejabberdctl muc_online_rooms muc.chapril.org | wc -l)"
+
+    echo "PUTVAL \"${HOSTNAME}/xmpp_accounts_created_lastday/count\" interval=$INTERVAL $(date +%s):$(count_accounts_created_lastday)"
 }
 
 http_upload_disk_usage() {
@@ -38,6 +40,19 @@ 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)"
 }
 
+count_accounts_created_lastday() {
+    _sql_ejabberd "
+    select count(*)
+    from users
+    where created_at > current_timestamp - interval '1 day'
+"
+}
+
+_sql_ejabberd() {
+    # XXX the psql command can only works if file /var/lib/ejabberd/.pgpass exists
+    psql -U ejabberd -h localhost ejabberd -c "${1}" -t | grep -v '^$' | awk '{print $1}'
+}
+
 # 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(){