fix(level-guesser): recognize "Information" as info level (#4833)

internal/container/level_guesser.go

@@ -15,7 +15,7 @@ var SupportedLogLevels map[string]struct{}
 var logLevels = [][]string{
 	{"error", "err"},
 	{"warn", "warning", "wrn"},
-	{"info", "inf"},
+	{"info", "inf", "information"},
 	{"debug", "dbg"},
 	{"trace", "verbose", "ver", "vbs"},
 	{"fatal", "sev", "severe", "crit", "critical"},

internal/container/level_guesser_test.go

@@ -115,6 +115,20 @@ func TestGuessLogLevel(t *testing.T) {
 		{"WARN: connection error: retrying", "warn"},
 		// Symmetric: an ERROR prefix still wins over a later info word.
 		{"ERROR: handler failed, info: will retry", "error"},
+		// .NET / Serilog / Microsoft.Extensions.Logging spell out "Information".
+		{"Information: service started", "info"},
+		{"[Information] service started", "info"},
+		{"2024-12-30T17:43:16Z Information starting up", "info"},
+		{orderedmap.New[string, string](
+			orderedmap.WithInitialData(
+				orderedmap.Pair[string, string]{Key: "level", Value: "Information"},
+			),
+		), "info"},
+		{orderedmap.New[string, any](
+			orderedmap.WithInitialData(
+				orderedmap.Pair[string, any]{Key: "@l", Value: "Information"},
+			),
+		), "info"},
 		// Equal confidence between two different levels -> unknown (don't guess).
 		{"saw info: here and error: there", "unknown"},
 		{"[INFO] [DEBUG] both bracketed", "unknown"},