From b21206c68cb2ec7885522a15a11687da0fb4cd67 Mon Sep 17 00:00:00 2001
From: Andreas Perhab <andreas.perhab@wt-io-it.at>
Date: Thu, 14 Oct 2021 14:34:35 +0200
Subject: [PATCH] systemd_mem: add env option to monitor all services

---
 plugins/systemd/systemd_mem | 24 ++++++++++++++++++++----
 1 file changed, 20 insertions(+), 4 deletions(-)

diff --git a/plugins/systemd/systemd_mem b/plugins/systemd/systemd_mem
index 3f743054..7a6df4d3 100755
--- a/plugins/systemd/systemd_mem
+++ b/plugins/systemd/systemd_mem
@@ -15,13 +15,20 @@ Example:
 
 env.services defaults to "munin-node".
 
+As an alternative you can use all_services to display memory for all running systemd services
+   [systemd_mem]
+   env.all_services true
+
+all_services shows memory for all running units of type service.
+
 =head1 VERSION
 
-1.0
+1.1
 
-=head1 AUTHOR
+=head1 AUTHORS
 
 Paul Alexandrow <paul@alexandrow.org>
+Andreas Perhab <a.perhab@wtioit.at>
 
 =head1 LICENSE
 
@@ -51,13 +58,22 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SO
 
 . "$MUNIN_LIBDIR/plugins/plugin.sh"
 
+for_services() {
+    if [ "$all_services" != "" ]; then
+        systemctl --type=service --state=running --no-pager --no-legend --output=short-precise \
+          | awk '{sub(".service$", "", $1); print $1}'
+    else
+        echo ${services:-"munin-node"}
+    fi
+}
+
 output_config() {
     echo "graph_title Systemd Service Memory Usage"
     echo "graph_info Memory usage for selected services as reported by systemctl"
     echo "graph_vlabel bytes"
     echo "graph_args --base 1024 --lower-limit 0"
     echo "graph_category memory"
-    for service in ${services:-"munin-node"}; do
+    for service in $(for_services); do
         clean_name="$(clean_fieldname "$service")"
         description=$(systemctl show "$service" --property=Description | cut -d '=' -f 2)
         warning=$(systemctl show "$service" --property=MemoryHigh | cut -d '=' -f 2)
@@ -77,7 +93,7 @@ output_config() {
 }
 
 output_values() {
-    for service in ${services:-"munin-node"}; do
+    for service in $(for_services); do
         clean_name="$(clean_fieldname "$service")"
         usage=$(systemctl show "$service" --property=MemoryCurrent | cut -d '=' -f 2)
         if [ "$usage" = "[not set]" ]; then