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Saves are not identifiable

Unless there is a perceptible effect from a spell the target might not even know they have resisted*resisted, so the Glyph won't be able to tell.

Other spells, such as charm person, display no visible, audible, or otherwise perceptible sign of their effects, and could easily go unnoticed by someone unaffected by them. As noted in the Player’s Handbook, you normally don’t know that a spell has been cast unless the spell produces a noticeable effect. (Perceiving a caster at work. XGTE p85)

There is a way around this, even if it does not work

Glyph 1 goes off and as part of the Geas you get them to immediately say a phrase / word.

Glyph 2 has a trigger of "same trigger as glyph 1 and phrase x not said within 1 second". The Geas from Glyph 2 also gets the target to say a different phrase / word.

Glyph 3 has a trigger of "same trigger as glyph 1 and phrase x or y not said within 2 seconds". The Geas from Glyph 3 also gets the target to say a different phrase / word.

Repeat...

In this case Glyph 1 will go off, if successful the target will say the phrase as part of the Geas, and not qualify as a trigger for the other Glyph's. If the Geas fails then they won't say the phrase and thus will quality for the trigger on Glyph 2 and Glyph 3. Glyph 2 will immediately go off, while Glyph 3 will be waiting to see if the phrase from Geas 2 is spoken, going off if necessary.

You can have as many as you need, and only need to reset those that have gone off.

*Citation pending when I get to my PHB, anyone who can find it faster is welcome to edit or comment

Saves are not identifiable

Unless there is a perceptible effect from a spell the target might not even know they have resisted*, so the Glyph won't be able to tell.

There is a way around this, even if it does not work

Glyph 1 goes off and as part of the Geas you get them to immediately say a phrase / word.

Glyph 2 has a trigger of "same trigger as glyph 1 and phrase x not said within 1 second". The Geas from Glyph 2 also gets the target to say a different phrase / word.

Glyph 3 has a trigger of "same trigger as glyph 1 and phrase x or y not said within 2 seconds". The Geas from Glyph 3 also gets the target to say a different phrase / word.

Repeat...

In this case Glyph 1 will go off, if successful the target will say the phrase as part of the Geas, and not qualify as a trigger for the other Glyph's. If the Geas fails then they won't say the phrase and thus will quality for the trigger on Glyph 2 and Glyph 3. Glyph 2 will immediately go off, while Glyph 3 will be waiting to see if the phrase from Geas 2 is spoken, going off if necessary.

You can have as many as you need, and only need to reset those that have gone off.

*Citation pending when I get to my PHB, anyone who can find it faster is welcome to edit or comment

Saves are not identifiable

Unless there is a perceptible effect from a spell the target might not even know they have resisted, so the Glyph won't be able to tell.

Other spells, such as charm person, display no visible, audible, or otherwise perceptible sign of their effects, and could easily go unnoticed by someone unaffected by them. As noted in the Player’s Handbook, you normally don’t know that a spell has been cast unless the spell produces a noticeable effect. (Perceiving a caster at work. XGTE p85)

There is a way around this, even if it does not work

Glyph 1 goes off and as part of the Geas you get them to immediately say a phrase / word.

Glyph 2 has a trigger of "same trigger as glyph 1 and phrase x not said within 1 second". The Geas from Glyph 2 also gets the target to say a different phrase / word.

Glyph 3 has a trigger of "same trigger as glyph 1 and phrase x or y not said within 2 seconds". The Geas from Glyph 3 also gets the target to say a different phrase / word.

Repeat...

In this case Glyph 1 will go off, if successful the target will say the phrase as part of the Geas, and not qualify as a trigger for the other Glyph's. If the Geas fails then they won't say the phrase and thus will quality for the trigger on Glyph 2 and Glyph 3. Glyph 2 will immediately go off, while Glyph 3 will be waiting to see if the phrase from Geas 2 is spoken, going off if necessary.

You can have as many as you need, and only need to reset those that have gone off.

1
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Saves are not identifiable

Unless there is a perceptible effect from a spell the target might not even know they have resisted*, so the Glyph won't be able to tell.

There is a way around this, even if it does not work

Glyph 1 goes off and as part of the Geas you get them to immediately say a phrase / word.

Glyph 2 has a trigger of "same trigger as glyph 1 and phrase x not said within 1 second". The Geas from Glyph 2 also gets the target to say a different phrase / word.

Glyph 3 has a trigger of "same trigger as glyph 1 and phrase x or y not said within 2 seconds". The Geas from Glyph 3 also gets the target to say a different phrase / word.

Repeat...

In this case Glyph 1 will go off, if successful the target will say the phrase as part of the Geas, and not qualify as a trigger for the other Glyph's. If the Geas fails then they won't say the phrase and thus will quality for the trigger on Glyph 2 and Glyph 3. Glyph 2 will immediately go off, while Glyph 3 will be waiting to see if the phrase from Geas 2 is spoken, going off if necessary.

You can have as many as you need, and only need to reset those that have gone off.

*Citation pending when I get to my PHB, anyone who can find it faster is welcome to edit or comment