Merge branch 'main' into REP-5218-transactions

Author: FGasper

README.md

@@ -257,6 +257,10 @@ Any collection metadata mismatches will occur in a task with the type '`verifyCo
 
 In this case, '`failed_docs`' contains all the meta data mismatches, in this case an index named '`x_1`'.
 
+# Resumability
+
+The migration-verifier periodically persists its change stream’s resume token so that, in the event of a catastrophic failure (e.g., memory exhaustion), when restarted the verifier will receive any change events that happened while the verifier was down.
+
 # Performance
 
 The migration-verifier optimizes for the case where a migration’s initial sync is completed **and** change events are relatively infrequent. If you start verification before initial sync finishes, or if the source cluster is too busy, the verification may freeze.

internal/logger/logger.go

@@ -14,6 +14,8 @@ import (
 const (
 	// DefaultLogLevel is the default log level
 	DefaultLogLevel = zerolog.InfoLevel
+
+	LogFileName = "migration-verifier.log"
 )
 
 // DefaultLogWriter is the default log io.Writer implementor
@@ -90,7 +92,7 @@ func NewRotatingWriter(dirPath string) (io.Writer, error) {
 	}
 
 	return &lumberjack.Logger{
-		Filename: path.Join(dirPath, "mongosync.log"),
+		Filename: path.Join(dirPath, LogFileName),
 	}, nil
 }