continue adding Handler logic; remove unused TxQueue tests

internal/debug_heaplog.go

@@ -21,6 +21,10 @@ var (
 	timebuf [len(timefmt) * 2]byte
 )
 
+func LogEnabled(l *slog.Logger, lvl slog.Level) bool {
+	return true
+}
+
 func LogAttrs(_ *slog.Logger, level slog.Level, msg string, attrs ...slog.Attr) {
 	now := time.Now()
 	n := len(now.AppendFormat(timebuf[:0], timefmt))

internal/debug_noheaplog.go

@@ -9,6 +9,10 @@ import (
 
 const HeapAllocDebugging = false
 
+func LogEnabled(l *slog.Logger, lvl slog.Level) bool {
+	return l != nil && l.Handler().Enabled(context.Background(), lvl)
+}
+
 // LogAttrs is a helper function that is used by all package loggers and that
 // can be switched out with the `debugheaplog` build tag for a non-allocating
 // logger that prints out when heap allocations occur.