public function getNormalizedLegacyConfiguration(): array
    {
        $normalizedConfiguration = [];
        foreach ($this->legacyConfiguration as $logIdentifier => $configuration) {
            // Skip everything that is not an actual log configuration.
            if (!isset($configuration['backend'])) {
                continue;
            }

            $backendObjectNames = $configuration['backend'];
            $backendOptions = $configuration['backendOptions'] ?? [];
            $normalizedConfiguration[$logIdentifier] = $this->mapLoggerConfiguration($backendObjectNames, $backendOptions);
        }

        return $normalizedConfiguration;
    }