Can Zap Logger\'s Log Level Be Adjusted Dynamically in Controller-Runtime?

Is Runtime Log Level Modification Possible with Zap Logger and Controller-Runtime?

Within controller-runtime, loggers are based on the Zap logger library. To modify the log level at runtime:

Creating a New AtomicLevel Logger:

Instead of using zap.New(), create an AtomicLevel logger:

atom := zap.NewAtomicLevel()

Custom Encoder Configuration:

For deterministic logging output, customize the encoder configuration:

encoderCfg := zap.NewProductionEncoderConfig()
encoderCfg.TimeKey = ""

Creating the Logger:

Combine the AtomicLevel and EncoderConfig to create a new logger:

logger := zap.New(zapcore.NewCore(
    zapcore.NewJSONEncoder(encoderCfg),
    zapcore.Lock(os.Stdout),
    atom,
))

Log Level Adjustment:

During runtime, you can modify the log level using the SetLevel() method:

atom.SetLevel(zap.ErrorLevel)

Integration with Controller-Runtime:

To use the customized logger with controller-runtime, configure it using the zap logger from sigs.k8s.io/controller-runtime/pkg/log/zap:

ctrl.SetLogger(zap.New(zap.UseAtomicLevel(&atom)))

By utilizing the AtomicLevel approach, you can dynamically change the log levels of the Zap logger used by controller-runtime, allowing you to adjust logging behavior during runtime without recreating the logger or affecting its other options.

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