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netwatch-notify: implemented simple dependency model

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This commit is contained in:
Christian Hesse 2020-11-17 15:03:01 +01:00
parent e1d9b08b9a
commit 6c14412aa9
2 changed files with 17 additions and 4 deletions
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13
doc/netwatch-notify.md
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@ -8,8 +8,9 @@ Description
This script sends notifications about host UP and DOWN events. In comparison
to just netwatch (`/ tool netwatch`) and its `up-script` and `down-script`
this script implements a simple state machine. Host down events are triggered
only if the host is down for several checks to avoid false alerts.
this script implements a simple state machine and dependency model. Host
down events are triggered only if the host is down for several checks and
optional parent host is not down to avoid false alerts.
Requirements and installation
-----------------------------
@ -39,6 +40,14 @@ The count threshould (default is 5 checks) is configurable as well:
/ tool netwatch add comment="notify, hostname=example.com, count=10" host=104.18.144.11;
If the host is behind another checked host add a dependency, this will
suppress notification if the parent host is down:
/ tool netwatch add comment="notify, hostname=gateway" host=93.184.216.1;
/ tool netwatch add comment="notify, hostname=example.com, parent=gateway" host=93.184.216.34;
Note that a configured parent increases the check count threshould by one.
Also notification settings are required for e-mail and telegram.
---

8
netwatch-notify
View file

@ -48,8 +48,12 @@
:set ($Metric->"since") ($HostVal->"since");
$LogPrintExit info ("Host " . $HostName . " (" . $HostVal->"host" . ") is down for " . \
$Metric->"count" . " checks.") false;
:if ($Metric->"count" >= [ $IfThenElse ([ :typeof ($HostInfo->"count") ] != "nothing") ($HostInfo->"count") 5 ] && \
$Metric->"notified" != true) do={
:local Count [ $IfThenElse ([ :tonum ($HostInfo->"count") ] > 0) ($HostInfo->"count") 5 ];
:local ParentNotified [ $IfThenElse (($NetwatchNotify->($HostInfo->"parent")->"notified") = true) true false ];
:if ([ :len ($HostInfo->"parent") ] > 0) do={
:set Count ($Count + 1);
}
:if ($ParentNotified = false && $Metric->"count" >= $Count && $Metric->"notified" != true) do={
$SendNotification ([ $SymbolForNotification "cross-mark" ] . "Netwatch Notify: " . $HostName . " down") \
("Host " . $HostName . " (" . $HostVal->"host" . ") is down since " . $HostVal->"since" . ".");
:set ($Metric->"notified") true;