netwatch-notify: allow to suppress resolve failure

2 files changed, 10 insertions, 1 deletions

diff --git a/doc/netwatch-notify.md b/doc/netwatch-notify.md
index 90cd830..2db32bb 100644
--- a/doc/netwatch-notify.md
+++ b/doc/netwatch-notify.md
@@ -104,6 +104,15 @@ powered off, but accessibility is of interest.
 
 Go and get your coffee ☕️ before sending the print job.
 
+### No log on failed resolve
+
+A message is writting to log after three failed attemts to resolve a host.
+However this can cause some noise for hosts that are expected to have
+failures, for example when the name is dynamically added by
+[`dhcp-to-dns`](dhcp-to-dns.md). This can be suppressed:
+
+    /tool/netwatch/add comment="notify, name=client, resolve=client.dhcp.example.com, no-resolve-fail" host=10.0.0.0;
+
 ### Add a note in notification
 
 For some extra information it is possible to add a text note. This is
diff --git a/netwatch-notify.rsc b/netwatch-notify.rsc
index 0b6c366..9b0beb9 100644
--- a/netwatch-notify.rsc
+++ b/netwatch-notify.rsc
@@ -116,7 +116,7 @@
             }
           } on-error={
             :set ($Metric->"resolve-failcnt") ($Metric->"resolve-failcnt" + 1);
-            :if ($Metric->"resolve-failcnt" = 3) do={
+            :if ($Metric->"resolve-failcnt" = 3 && $HostInfo->"no-resolve-fail" != true) do={
               $LogPrint warning $ScriptName ("Resolving name '" . $HostInfo->"resolve" . [ $IfThenElse \
                   ($HostInfo->"resolve" != $HostInfo->"name") ("' for " . $Type . " '" . \
                   $HostInfo->"name") "" ] . "' failed.");