Aggregate unique tags per trace (independent tag counting) for charts

[jreivilo]

Describe the feature or potential improvement

Hey everyone :)

Problem

Currently, when a trace has multiple tags, Langfuse aggregates them as a single combined value (e.g. agent:upsell + agent:information).

This makes it impossible to:

• count tags independently
• create meaningful charts (bar, pie, tables) showing usage per tag

This is especially limiting when tags represent agents, roles, or routing logic.

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Use Case

We use tags to identify which agent is called in a trace and want to:

• count how many times each agent is used
• compare agent usage against total traces

This is not possible when tags are grouped together.

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Example

Trace	Tags
T1	agent:upsell
T2	agent:information
T3	agent:upsell, agent:information

Current ❌

• agent:upsell → 1
• agent:information → 1
• agent:upsell + agent:information → 1

Expected ✅

• agent:upsell → 2
• agent:information → 2
• Total traces → 3

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Proposed Solution

It would be useful if charts could treat each tag as an independent value, even when multiple tags are attached to the same trace.

In other words, tags should be counted separately per trace, rather than as a combined group.
This could be exposed as an optional chart aggregation mode to preserve current behavior.

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Thanks 🙌

Additional information

No response

[jannikmaierhoefer]

Thanks for adding this @jreivilo!

[jannikmaierhoefer]

@jreivilo I assume you are currently seeing something like this - is this correct?

[jreivilo]

Hey @jannikmaierhoefer

Yes exactly :)