Tiger on exact time and date

[Alfista]

Hi,

I need to run trigger on exact time.
I use this expression:

dayofweek()=1 $ time()=080000

but I can't use it while I have this error:

Cannot add trigger
Invalid parameter "/1/expression": incorrect expression starting from "$ time()=080000". [triggers.php:300 → CApiWrapper->__call() → CFrontendApiWrapper->callMethod() → CApiWrapper->callMethod() → CFrontendApiWrapper->callClientMethod() → CLocalApiClient->callMethod() → CTrigger->create() → CTriggerGeneral->validateCreate() → CApiService::exception() in include/classes/api/services/CTriggerGeneral.php:1009]​

Please can you help me and tell me where is the problem?
Thanks

[cyber]

Of course trigger will not work without any reference to any key... What would you be calculating otherwise?

& will not work also AND (as I suggested, I wanted to emphasize the word itself, not the case, bad attempt.. ), just lowercase and.

[cyber]

(incorrect expression starting from "$....)
$ does not work there... use AND

[Alfista]

Sorry my mistake.
I use the Zabbix version 6.4.4
There should be "&", but it will not work even there is an any function alone. I tried also to do it with expression constructor and still ai get error:

Invalid parameter "/1/expression": trigger expression must contain at least one /host/key reference. [triggers.php:300 → CApiWrapper->__call() → CFrontendApiWrapper->callMethod() → CApiWrapper->callMethod() → CFrontendApiWrapper->callClientMethod() → CLocalApiClient->callMethod() → CTrigger->create() → CTriggerGeneral->validateCreate() → CApiService::exception() in include/classes/api/services/CTriggerGeneral.php:1009]

[cyber]

Of course trigger will not work without any reference to any key... What would you be calculating otherwise?

& will not work also AND (as I suggested, I wanted to emphasize the word itself, not the case, bad attempt.. ), just lowercase and.

[Alfista]

I use this now:

dayofweek()=1 AND time()=080000

and have this error:

Invalid parameter "/1/expression": incorrect expression starting from "AND time()=080000". [triggers.php:300 → CApiWrapper->__call() → CFrontendApiWrapper->callMethod() → CApiWrapper->callMethod() → CFrontendApiWrapper->callClientMethod() → CLocalApiClient->callMethod() → CTrigger->create() → CTriggerGeneral->validateCreate() → CApiService::exception() in include/classes/api/services/CTriggerGeneral.php:1009]

What I do wrong? Why it will not work?

[Semiadmin]

As cyber already said, there must be at least one item in the trigger. And then, if you are very lucky, your trigger will fire (with a probability of 1/30)

[cyber]

And as I said...

& will not work also AND (as I suggested, I wanted to emphasize the word itself, not the case, bad attempt.. ), just lowercase and.

[Alfista]

Thanks understand - i need leave there any item that is taken from the Host and then I can add there my triger items.
This isnt written in the manual that thistrigger functions cant be used allone in the trigger. I thing this is a byg mistake while some trigers need to be releated to some procedures that should be done on exact time and this will help to remember if you forgote to do it.
I have now change the trigger to:

last(/192.168.22.50/system.uptime)<7d and dayofweek()=2 and time()=080000

Thanks.

[Semiadmin]

....and between(time(),080000,080100)

[Alfista]

Great sugestion. Thanks.

[cyber]

This isnt written in the manual that thistrigger functions cant be used allone in the trigger. .

https://www.zabbix.com/documentation/6.0/en/manual/appendix/functions/time

Attention: Date and time functions cannot be used in the expression alone; at least one non-time-based function referencing the host item must be present in the expression.

But what would you trigger without any item values? Just a notification popup/reminder? That is really something that triggers are not meant to do..
You can probably utilize calculated items, which will calculate some dummy value every minute (as simple as just return value 1 every minute) and then use it together with those day/time functions to trigger some alert(s). But you have to have an item in calculation..