fff-nodewatcher: add available memory to data

The "available" amount of memory is helpful for several forensic
and debugging cases. Send it via alfred.

Monitoring support has already been implemented.

Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
Reviewed-by: Fabian Bläse <fabian@blaese.de>

src/packages/fff/fff-nodewatcher/Makefile

@@ -1,7 +1,7 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=fff-nodewatcher
-PKG_RELEASE:=60
+PKG_RELEASE:=61
 
 include $(INCLUDE_DIR)/package.mk
 

src/packages/fff/fff-nodewatcher/files/usr/lib/nodewatcher.d/10-systemdata.sh

@@ -39,6 +39,7 @@ SYSTEM_DATA="$SYSTEM_DATA$uptime"
 
 memory=$(awk '
 	/^MemTotal/ { printf "<memory_total>"$2"</memory_total>" }
+	/^MemAvail/ { printf "<memory_available>"$2"</memory_available>" }
 	/^Cached:/ { printf "<memory_caching>"$2"</memory_caching>" }
 	/^Buffers/ { printf "<memory_buffering>"$2"</memory_buffering>" }
 	/^MemFree/ { printf "<memory_free>"$2"</memory_free>" }