Stop logging chunks (#4056)

We should not be logging raw chunks, even at level 5 after decoder failures. Removing the chunk from the message makes it effectively useless, so I removed the message entirely.

Author: rosecodym

pkg/engine/engine.go

@@ -785,7 +785,7 @@ func (e *Engine) scannerWorker(ctx context.Context) {
 			decodeLatency.WithLabelValues(decoder.Type().String(), chunk.SourceName).Observe(float64(decodeTime))
 
 			if decoded == nil {
-				ctx.Logger().V(5).Info("decoder not applicable for chunk", "decoder", decoder.Type().String(), "chunk", chunk)
+				// This means that the decoder didn't understand this chunk and isn't applicable to it.
 				continue
 			}