Missing temperature sensor should not generate a warning

[danepowell]

Use Case

On many (probably most) systems, there's at least one temperature sensor with no data (see #5692 ), and this is completely normal and expected.

Expected behavior

The missing temperature is logged only as a debug message, given that this is normal and expected behavior. The developer guidelines say:

Don't log a warning every time a plugin is called for situations that are normal on some systems.

Actual behavior

The missing temperature is logged as a warning, leading to logs full of this warning and decreasing the visibility of more serious warnings:

[inputs.temp] Couldn't read temperature from "/sys/class/hwmon/hwmon2/temp1_input": read /sys/class/hwmon/hwmon2/temp1_input: no data available

Additional info

No response

[powersj]

Hi,

Willing to put up a PR?

At first I was a little hesitant to make this change given the history. I think the temp plugin pre-dates the dev guidelines ;) However, after thinking about it, it makes a lot of sense to either print them once, or change them to debug.

[danepowell]

Happy to post a PR, thanks. Just wanted to make sure it would be accepted.