The article is a bit confusing, because the title says 5, the article gives 6 (Error, Warning, Info, Debug, Trace, and Fatal), but the article casts doubt on whether either of those is right when it says this:
I would like to talk about the five (or six, or four) that I find are the most crucial, the fundamental set to base your own levels (and your thinking) on.
Which are the 2 from the 6 given whose status as levels of logging is in doubt?
He orders it in terms of relevance too. Note that the last two levels he states are Trace and Fatal. He talks about how Trace may not always be enabled, or how Fatal doesn't necessarily make sense if such an error needs to be handled manually anyways.
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The article is a bit confusing, because the title says 5, the article gives 6 (Error, Warning, Info, Debug, Trace, and Fatal), but the article casts doubt on whether either of those is right when it says this:
Which are the 2 from the 6 given whose status as levels of logging is in doubt?
He orders it in terms of relevance too. Note that the last two levels he states are Trace and Fatal. He talks about how Trace may not always be enabled, or how Fatal doesn't necessarily make sense if such an error needs to be handled manually anyways.