Welcome to the README.Debian for spine.  here's a quick outline
of the contents:

- Setting up spine
- Troubleshooting
  - No polling and all the error log says is "Partial Result"

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Setting up spine
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Once spine is installed on your system, you must perform the following
steps to make your Cacti installation aware of it.

0.  Verify the contents of /etc/cacti/spine.conf are correct (they should be)
1.  Login to Cacti as an admin user.
2.  Select Settings on the menu and click the Paths tab.
3.  Enter the complete path to your spine binary (/usr/sbin/spine)
    in the Spine Poller File Path field and click Save.
4.  Click the Poller tab.
5.  Choose "spine" from the Poller Type dropdown box and click Save.

After completing these steps, Cacti will spawn spine every 5 minutes
instead of cmd.php. If you are having problems getting spine to gather
data, you can always temporarily change Poller Type back to "cmd.php".

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Troubleshooting
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If spine didn't work for you out of the box, or something broke, and there was
a quick fix, file a wishlist/minor bugreport against spine with your
suggestion and we will probably write something in here about it.

  - No polling and all the error log says is "Partial Result"

  Go through all your Data Input Methods and make sure the full path to
  the executable scripts are specified (i.e. /usr/bin/perl and not perl)

  - If spine not running properly if querying non-free mibs, you should install
    snmp-mibs-downloader which in non-free archive.