Spell Glyph. You can store a prepared spell of 3rd level or lower in the glyph by casting it as part of creating the glyph. The spell must target a single creature or an area. The spell being stored has no immediate effect when cast in this way. When the glyph is triggered, the stored spell is cast. If the spell has a target, it targets the creature that triggered the glyph. If the spell affects an area, the area is centered on that creature. If the spell summons hostile creatures or creates harmful objects or traps, they appear as close as possible to the intruder and attack it. If the spell requires concentration, it lasts until the end of its full duration.
Do summoning spells placed in a Glyph of Warding require concentration from the character?
" If the spell requires concentration, it lasts until the end of its full duration."
As per the spell (emphasis is mine)
Yeah realized i left out about if that means the character is required to concentrate or the glyph is "concentrating" on the spell