added alarms about dropped packets ratio

conf.d/health.d/net.conf

@@ -20,14 +20,48 @@ template: interface_last_collected_secs
 # the alarm is checked every 1 minute
 # and examines the last hour of data
 
-template: 1hour_packet_drops
+template: 1hour_packet_drops_inbound
       on: net.drops
-  lookup: sum -1h unaligned absolute
+  lookup: sum -1h unaligned absolute of inbound
+   units: packets
+   every: 1m
+    warn: $this > 0
+   delay: down 30m multiplier 1.5 max 1h
+    info: interface inbound dropped packets in the last hour
+      to: sysadmin
+
+template: 1hour_packet_drops_outbound
+      on: net.drops
+  lookup: sum -1h unaligned absolute of outbound
    units: packets
    every: 1m
     warn: $this > 0
    delay: down 30m multiplier 1.5 max 1h
-    info: interface dropped packets in the last hour
+    info: interface outbound dropped packets in the last hour
+      to: sysadmin
+
+template: 1hour_packet_drops_ratio_inbound
+      on: net.packets
+  lookup: sum -1h unaligned absolute of received
+    calc: (($1hour_packet_drops_inbound != nan AND $this > 0) ? ($1hour_packet_drops_inbound * 100 / $this) : (0))
+   units: %
+   every: 1m
+    warn: $this > 0.5
+    crit: $this > 3
+   delay: down 30m multiplier 1.5 max 1h
+    info: the ratio of inbound dropped packets vs the total number of received packets of the network interface, during the last hour
+      to: sysadmin
+
+template: 1hour_packet_drops_ratio_outbound
+      on: net.packets
+  lookup: sum -1h unaligned absolute of sent
+    calc: (($1hour_packet_drops_outbound != nan AND $this > 0) ? ($1hour_packet_drops_outbound * 100 / $this) : (0))
+   units: %
+   every: 1m
+    warn: $this > 0.5
+    crit: $this > 3
+   delay: down 30m multiplier 1.5 max 1h
+    info: the ratio of outbound dropped packets vs the total number of sent packets of the network interface, during the last hour
       to: sysadmin