Logging severity.
Constants
| DEBUG | = | 0 |
Low-level information, mostly for developers |
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| INFO | = | 1 |
generic, useful information about system operation |
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| WARN | = | 2 |
a warning |
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| ERROR | = | 3 |
a handleable error condition |
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| FATAL | = | 4 |
an unhandleable error that results in a program crash |
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| UNKNOWN | = | 5 |
an unknown message that should always be logged |
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