Change resolution of graphs in mail notifications

[kaiserchrss (Christian Kaiser)]

Hi,

first of all, I am using cre1.6.0.p11 on a Debian 10 system.

im trying to change the resolution in a mail notification that shows the room temperature of our server rooms.

We need a higher resolution of the following graph:

I have found out, that you will need to change the notification script for that.
I found the notification scripts in: /opt/omd/sites/main/share/check_mk/notifications.
Here the mail notification-plugin is linked to another file, which is:
/opt/omd/versions/1.6.0p11.cre/lib/python/cmk/notification_plugins/mail.py
/opt/omd/versions/1.6.0p11.cre/lib/python/cmk/notification_plugins/mail.pyc

I have tried to see for myself, if I can find any hints on how to change the resolution inside the python file.
But the only thing I have found are the following entries (for Nagios core):

But inside this function i can’t find where the resolution is handled. Do you guys have any idea?

Best regards,
Christian Kaiser

[andreas-doehler (Andreas)]

For PNP4Nagios the parameter “view” inside the URL is setting the timeframe.
You see in the fetch_graph function view is set to 1.
If i remember it correctly 0 is 4 hours, 1 is 24, 2 is 7 days and so on.
You can check this if you look at the URLs inside PNP if you open a graph for a specific time range. There you will also see the view parameter.

[kaiserchrss (Christian Kaiser)]

Hi Andreas,

thanks a lot!
I think this is exactly what I was looking for.

I was trying to test your solution by creating a copy of the notification plugin (called it “mail2”) and the corresponding .py-file (called it “mail2.py”) and then compiled the py-File with the command:

pycompile /opt/omd/versions/1.6.0p11.cre/lib/python/cmk/notification_plugins/mail2.py.
Which outputted the correspondig bytecode-file: mail2.pyc

Then I did an OMD restart

I’m not 100% sure if i missed anything but it looks different than my original HTML Mail.
When i try to create a new notification rule with this setting, it doenst show any parameters i could edit:

See the original HTML Mail:

And my copied one that i edited:

[kaiserchrss (Christian Kaiser)]

I should add, that I changed the plugin file to import “mail2” as well:

[kaiserchrss (Christian Kaiser)]

I’ve found another directory where the plugins are located. Tried compiling the .py file here to.
Still the same on the WATO though…

[andreas-doehler (Andreas)]

Modification of the default mail plugin is a little bit difficult.
If you want all the options of the original plugin then you can not duplicate it.

I do it on my systems the following way.

• copy ~/lib/python/cmk/notifications/mail.py to ~/local/lib/python
• copy ~/share/check_mk/notifications/mail to ~/local/share/check_mk/notifications
• modify line 2 of ~/local/share/check_mk/notifications/mail - append a “modified” or something else
  also change the import line to import mail
• modify the ~/local/lib/python/mail to your needs

That’s all, now you will use the modified mail notification the same way as before the original mail.
You don’t have to compile anything.

[kaiserchrss (Christian Kaiser)]

Hi Andreas,

thank you very much for your detailed instructions.
With your hint how to duplicate the Mail-plugin I finally got it to work and it works perfectly.

Best regards,
Christian Kaiser

[neeloj (Neeloj A.)]

@kaiserchrss if you dont mind, can you post your changes here, it will be really helpful for one of us in the future… Thanks

[kaiserchrss (Christian Kaiser)]

Sure thing.
I folllowed the instructions on how to duplicate the Mail Plugin (Andreas’ second post).
I opened the File /opt/omd/sites/main/local/share/check_mk/notifications/mail with a text editor. Then I changed the second line from HTML Email to HTML EmailGraph4hours.

Then I went to the file thats being imported in by the one mentioned above.
This file is here: /opt/omd/sites/main/local/lib/python/mail.py

In this file you need to change the integer value in the function “fetch_graph”. It’s on line 662

Here i changed the line “def fetch_graph(context, source, view=1):” to “def fetch_graph(context, source, view=0):”

You can see what kind of graph each value outputs if you open a single graph in Check_MK in a new window and check the URL. i. e.:

Afterwards do a “omd restart” and it should appear in the notification plugin drop-down menu on the check_mk site.

Best regards,
Christian

[neeloj (Neeloj A.)]

thank you so much @kaiserchrss this will be helful for all of us