Respect log level

[marceloboeira]

I want to avoid overflowing my logs with:

{"FlagEvalResult":{"evalContext":{"entityID":"a8f155220fad675898b52160340a85e2","entityType":"user","flagID":1},"evalDebugLog":{"segmentDebugLogs":[]},"flagID":1,"flagSnapshotID":36,"segmentID":1,"timestamp":"2018-04-11T10:21:17Z","variantAttachment":{},"variantID":2,"variantKey":"heart"}}
{"FlagEvalResult":{"evalContext":{"entityID":"ea132b7d85d5fc333efda94088923f44","entityType":"user","flagID":1},"evalDebugLog":{"segmentDebugLogs":[]},"flagID":1,"flagSnapshotID":36,"segmentID":1,"timestamp":"2018-04-11T10:21:18Z","variantAttachment":{},"variantID":2,"variantKey":"heart"}}
{"FlagEvalResult":{"evalContext":{"entityID":"02f026d0f04d03818f5d41f3b73f062b","entityType":"user","flagID":1},"evalDebugLog":{"segmentDebugLogs":[]},"flagID":1,"flagSnapshotID":36,"segmentID":1,"timestamp":"2018-04-11T10:21:19Z","variantAttachment":{},"variantID":2,"variantKey":"heart"}}
{"FlagEvalResult":{"evalContext":{"entityID":"fa8f1f5ccbafcae6fe40f4d752019a1c","entityType":"user","flagID":1},"evalDebugLog":{"segmentDebugLogs":[]},"flagID":1,"flagSnapshotID":36,"segmentID":1,"timestamp":"2018-04-11T10:21:21Z","variantAttachment":{},"variantID":2,"variantKey":"heart"}}
{"FlagEvalResult":{"evalContext":{"entityID":"50f18fc583ed933f924256d28912cf26","entityType":"user","flagID":1},"evalDebugLog":{"segmentDebugLogs":[]},"flagID":1,"flagSnapshotID":36,"segmentID":1,"timestamp":"2018-04-11T10:21:22Z","variantAttachment":{},"variantID":1,"variantKey":"star"}}
{"FlagEvalResult":{"evalContext":{"entityID":"59caa1edad40e8147429eeb0c80ba700","entityType":"user","flagID":1},"evalDebugLog":{"segmentDebugLogs":[]},"flagID":1,"flagSnapshotID":36,"segmentID":1,"timestamp":"2018-04-11T10:21:24Z","variantAttachment":{},"variantID":1,"variantKey":"star"}}
{"FlagEvalResult":{"evalContext":{"entityID":"ebac32864a64579e52d3c9eb0a253a3c","entityType":"user","flagID":1},"evalDebugLog":{"segmentDebugLogs":[]},"flagID":1,"flagSnapshotID":36,"segmentID":1,"timestamp":"2018-04-11T10:21:26Z","variantAttachment":{},"variantID":2,"variantKey":"heart"}}
{"FlagEvalResult":{"evalContext":{"entityID":"34c4a87d0e8645fde4d11285c5ebc847","entityType":"user","flagID":1},"evalDebugLog":{"segmentDebugLogs":[]},"flagID":1,"flagSnapshotID":36,"segmentID":1,"timestamp":"2018-04-11T10:21:27Z","variantAttachment":{},"variantID":2,"variantKey":"heart"}}

Expected Behavior

LOG_LEVEL = warning -> disables logging of individual requests / flag eval results

[zhouzhuojie]

How about introducing a new env variable setting?
E.g. FLAGR_EVAL_LOGGING_ENABLED