The Linux platform channels sample makes a call to the libupower function up_client_get_devices, which was deprecated in libupower 0.99.8 in favour of up_client_get_devices2.

The prod bots have been migrated to focal, which ships libupower 0.99.11 in which the old function is deprecated and the new one is available.

The try bots have not yet been migrated and remain on bionic, which ships libupower 0.99.7 in which the old function is not deprecated and the new one is not available.

This marks the line in question to ignore deprecation warnings. Once all bots have migrated to focal, we'll migrate to the new function. See tracking issue below.

See: https://upower.freedesktop.org/docs/UpClient.html#up-client-get-devices

Related issue: #127506