Action :start is not idempotent

[voroniys]

The script resource for :start action has no guards, and thus executed each time chef-client runs. It should get not_if/only_if guard to execute only if needed.

[gothick]

I think this may be what's causing some of my stats not to be sent, as I have their frequency configured less often than my chef client runs, and that causes the agent to be killed before it can ever send the stat.