From f96d6ae4f43ff6350e339eb895f13a6dd4c6cc6f Mon Sep 17 00:00:00 2001
From: m0duspwnens <josh.patterson@securityonionsolutions.com>
Date: Wed, 7 Oct 2020 11:06:54 -0400
Subject: [PATCH] only send loss if timestamp on data has changed

---
 salt/telegraf/scripts/zeekcaptureloss.sh | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/salt/telegraf/scripts/zeekcaptureloss.sh b/salt/telegraf/scripts/zeekcaptureloss.sh
index 19be68280..f6302566d 100644
--- a/salt/telegraf/scripts/zeekcaptureloss.sh
+++ b/salt/telegraf/scripts/zeekcaptureloss.sh
@@ -2,9 +2,15 @@
 # This script returns the average of all the workers average capture loss to telegraf / influxdb in influx format include nanosecond precision timestamp
 {%- set WORKERS = salt['pillar.get']('sensor:zeek_lbprocs', salt['pillar.get']('sensor:zeek_pins') | length) %}
 ZEEKLOG=/host/nsm/zeek/spool/logger/capture_loss.log
+LASTCAPTURELOSSLOG=/script/lastcaptureloss.txt
 if [ -f "$ZEEKLOG" ]; then
-  LOSS=$(tail -{{WORKERS}} $ZEEKLOG | awk -F, '{print $NF}' | sed 's/}//' | awk -F: '{LOSS += $2 / {{WORKERS}}} END { print LOSS}')
-  TS=$(tail -1 $ZEEKLOG | jq .ts | sed 's/"//g')
-  TSNANO=$(echo "$(date -d "$TS" +"%s.%N") 1000000000 * p" | dc | awk -F. {'print $1'})
-  echo "zeekcaptureloss loss=$LOSS $TSNANO"
+  CURRENTTS=$(tail -1 $ZEEKLOG | jq .ts | sed 's/"//g')
+  if [ -f "$LASTCAPTURELOSSLOG" ]; then
+    LASTTS=$(cat /script/lastcaptureloss.txt)
+    if [[ "$LASTTS" != "$CURRENTTS" ]]; then
+      LOSS=$(tail -{{WORKERS}} $ZEEKLOG | awk -F, '{print $NF}' | sed 's/}//' | awk -F: '{LOSS += $2 / {{WORKERS}}} END { print LOSS}')
+      echo "zeekcaptureloss loss=$LOSS"
+    fi
+  fi
+  echo "$CURRENTS" > "$LASTCAPTURELOSSLOG"
 fi
\ No newline at end of file