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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