Fontconfig cannot detect Noto Sans Mono as a monospace font. Also Font Viewer app says that font has "proportional" spacing instead of "monospace" (see screenshot). Because of that, this font cannot be used in applications accepting only monospace font (for example Linux terminal emulators).
Defect Report
Title
Font
Where the font came from, and when
Font Version
OS name and version
Issue
Fontconfig cannot detect Noto Sans Mono as a monospace font. Also Font Viewer app says that font has "proportional" spacing instead of "monospace" (see screenshot). Because of that, this font cannot be used in applications accepting only monospace font (for example Linux terminal emulators).
As stated in https://www.freedesktop.org/software/fontconfig/fontconfig-user.html, fontconfig uses "spacing=100" property for matching monospace fonts and Noto Sans Mono is missing that property.
I unpacked legacy Noto Mono font from the Debian package and that one contains required property and also can be used as a monospace font.
Screenshot