Logging, yo.

Logging kind of sucks.

• Log metrics (record latencies, counts, rates, etc)
• Log structured data
• Should be context aware (Log a message + context)
• Allow writing to multiple targets (files, syslog, etc)
• Support log levels
• Support profiling (random sampling of requests)
• Should be tunable at runtime

Sample output

{"timestamp":"2011-08-26T06:59:06.908Z","message":"l1"}
{"timestamp":"2011-08-26T06:59:06.909Z","message":"l2","foo":"bar"}
{"timestamp":"2011-08-26T06:59:06.910Z","message":"l3","bar":"baz","foo":"bar"}
{"timestamp":"2011-08-26T06:59:06.910Z","message":"Some funky errors, man","exception":{"stack":"Error: Woo\n    at Object.<anonymous> (/home/jls/projects/nodejs-logging/build/lib/logging.js:60:11)\n    at Object.<anonymous> (/home/jls/projects/nodejs-logging/build/lib/logging.js:66:4)\n    at Module._compile (module.js:407:26)\n    at Object..js (module.js:413:10)\n    at Module.load (module.js:339:31)\n    at Function._load (module.js:298:12)\n    at Array.0 (module.js:426:10)\n    at EventEmitter._tickCallback (node.js:126:26)","message":"Woo"},"bar":"baz","foo":"bar"}