Zabbix queue backlog with IIS AppPool current queue size items

[andrewkirwin]

Zabbix Server: 7.0.17
Zabbix Agent 2 (Windows): 7.0.30
Client: Windows Server 2022 Standard
Template: IIS by Zabbix Agent (7.0-3)

Hi All,

I am experiencing an issue with the IIS by Zabbix Agent AppPool current queue size item getting stuck in the queue when the AppPool is stopped, or running but unassigned.

I have investigated the Zabbix Agent 2 logs on the client machine and believe I have found the culprit, but was wondering if anyone else has seen or been able to resolve this issue?

got nil value, skipping sending of response

I see this after the agent is queried for the AppPool current queue size of a stopped/unassigned IIS application on version 7.0.30 of the Windows client.

Rolling back to version 7.0.12 I get the below...

sending passive check response: '{"version":"7.0.12","variant":2,"data":[{value":null}]}' to 'PROXY-IP-REDACTED'

Suggesting a change in logic between the versions, where the older version sends a "null" value and the newer version doesn't send anything.

Sending nothing means the item sits in the queue on the server... waiting for a value... forever.

Thanks in advance for you assistance,

Andrew