Add degraded status for command 'script'

[brknkfr]

• I read CONTRIBUTING.md
• I used tabs to indent
• I checked my code with ShellCheck

Notes

I wanted to monitor multiple websites (services) on one webserver (server). If one website is failing, the status of the item Websites should not be failing, but only degraded (exit returncode of script command has to be 80).

Now this is only possible with the script command.

Changes in this pull request:

• add function check_degradetime
• add function save_degradetime
• add example script for checking multiple websites (check-websites.sh)
• add example config status_website_list.txt

More minor changes in this pull request:

• Changed operational, degraded and outage main message
• Colours: green checks, orange status badges, blue degraded message

[Cyclenerd]

Thanks for your first GitHub pull. I repeat as I understand:

• Besides up and down you introduce another state degrade.
• This status is only given to script checks that return code 80.
• Degraded counts as down for the sum (alert warning...)
• Degraded is not displayed in the history

Have I understood this correctly?

Also, please take a look at my other comments. I do not agree with the color change. Also, please look at the return codes. Currently, everything other than 0 is a failure.

[brknkfr]

Thanks for your first GitHub pull. I repeat as I understand:

* Besides up and down you introduce another state `degrade`.

Yes, but only for the script command.

* This status is only given to script checks that return code `80`.

Yes. Actually, we could choose whatever exit code we want. There is no special reason for 80 (everything after 78 is not defined in sysexits.h)

* Degraded counts as down for the sum (alert warning...)

Yes.

* Degraded is not displayed in the history

Yes.

I'll probably change that later in a way you could see in the past incidents the reason of the failure (fail or degrade).

Have I understood this correctly?

You did.

Also, please take a look at my other comments. I do not agree with the color change. Also, please look at the return codes. Currently, everything other than 0 is a failure.

I'll be back with another force push ...

[Cyclenerd]

Cool idea and implementation. Thank you very much. If you want, you can also customize the README with a new pull.

[brknkfr]

Cool idea and implementation. Thank you very much. If you want, you can also customize the README with a new pull.

And probably a test for test.sh ...