fix: add collect.info_schema.processlist  in the percona exporter (#1985)

diff --git a/roles/percona_xtradb_cluster/vars/main.yml b/roles/percona_xtradb_cluster/vars/main.yml
index a7a5760..89678c8 100644
--- a/roles/percona_xtradb_cluster/vars/main.yml
+++ b/roles/percona_xtradb_cluster/vars/main.yml
@@ -18,6 +18,7 @@
         image: "{{ atmosphere_images['prometheus_mysqld_exporter'] | vexxhost.kubernetes.docker_image('ref') }}"
         args:
           - --mysqld.username=monitor
+          - --collect.info_schema.processlist
         env:
           - name: MYSQLD_EXPORTER_PASSWORD
             valueFrom: