This file is indexed.

/etc/update-manager/meta-release is in ubuntu-release-upgrader-core 1:18.04.17.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# default location for the meta-release file

[METARELEASE]
URI = https://changelogs.ubuntu.com/meta-release
URI_LTS = https://changelogs.ubuntu.com/meta-release-lts
URI_UNSTABLE_POSTFIX = -development
URI_PROPOSED_POSTFIX = -proposed