Trigger macro naming

[ebrajoh]

I'm sharing a method of naming triggers with macros,.

I've set up a couple of triggers that trigger actions from one (more than one actually) item but get their name from oneother. Se below:

{Template_MSC:r.1.strlen(0)}<0 | {Template_MSC:nidl.1.last(0)}=0 & {Template_MSC:nocc.1.last(0)}>0 & {Template_MSC:r.1.regexp(.*?S[O|I])}=0

The trick is to or the naming item with a nonsense expression. The nonsense expression in this case is "{Template_MSC:r.1.strlen(0)}<0" since a string cant have a length < 0.

The name can then be selected with something like below, where {ITEM.VALUE1} selects the first items value (the naming items value):
Route {ITEM.VALUE1} in {HOSTNAME} no idle device

[untergeek]

I discovered the same thing, though I've used the str(NULL) on mine, checking for a non-null answer. I think your solution may be less taxing on the database than mine.

[mushero]

I am clearly not smart enough to figure this out - what problem are we solving and how does this do that with the nonsense expression ? Seems to be missing a few pieces for me to understand.

[ebrajoh]

If you post what you want to do mushero. I can help you explain how to do that.

[fredo2906]

Thank you for sharing that. You may be able to help me with my issue.

I have an item key as follow:
ssh,[{$SSH_PORT}]

And I want to set a trigger like that
{aserver:ssh,[{$SSH_PORT}].last(0)}=1

I get the following error :
* Not allowed symbols or sequence of symbols in expression element detected: Check expression part starting from ' [{$SSH_PORT}].last(0)}=1 '
* Not allowed symbols or sequence of symbols in expression element detected: Check expression part starting from ' ].last(0)}=1 '

Why?

[JBo]

Hi,

Thank you for sharing that. You may be able to help me with my issue.

I have an item key as follow:
ssh,[{$SSH_PORT}]

And I want to set a trigger like that
{aserver:ssh,[{$SSH_PORT}].last(0)}=1

I get the following error :
* Not allowed symbols or sequence of symbols in expression element detected: Check expression part starting from ' [{$SSH_PORT}].last(0)}=1 '
* Not allowed symbols or sequence of symbols in expression element detected: Check expression part starting from ' ].last(0)}=1 '

Why?

First, you should start your own thread when your question is unrelated to the problem discussed here.

Anyway, your item syntax is wrong. Check ssh,<port> in documentation.
It should be :
ssh,{$SSH_PORT}

If you still have problem, just start a new thread

Hope this helps,
JBo

[ebrajoh]

I agree with JBo that the problem is unrelated. Though, I'm not that sure that you can use "user defined macros" like that at all :-(

[fredo2906]

Yes I know, sorry for that.
Actually thanks to all for the replies. The problem was related to the naming.

[mushero]

If you post what you want to do mushero. I can help you explain how to do that.

Not that I wanted to do something, but was trying to figure out how I can use this, i.e. what problem it's solving to use a macro in the name (though I think I can see some value), and not clear which item in the first post is the macro, i.e. would be great to use a host macro, too. Would appear he wants the item value in the name.