feat(ai): Compute context utilization on AI spans

CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## Unreleased
 
+**Features**:
+
+- Add `ModelMetadata` config with context size and utilization. ([#5814](https://github.com/getsentry/relay/pull/5814))
+
 **Internal**:
 
 - Move unreal crash report expansion from processing into endpoint. ([#5825](https://github.com/getsentry/relay/pull/5825))

relay-cabi/src/processing.rs

@@ -265,8 +265,8 @@ pub unsafe extern "C" fn relay_store_normalizer_normalize_event(
         max_tag_value_length: usize::MAX,
         span_description_rules: None,
         performance_score: None,
-        geoip_lookup: None,   // only supported in relay
-        ai_model_costs: None, // only supported in relay
+        geoip_lookup: None,      // only supported in relay
+        ai_model_metadata: None, // only supported in relay
         enable_trimming: config.enable_trimming.unwrap_or_default(),
         measurements: None,
         normalize_spans: config.normalize_spans,

relay-conventions/src/consts.rs

@@ -34,6 +34,8 @@ convention_attributes!(
     ENVIRONMENT => "sentry.environment",
     EVENT_NAME => "event.name",
     FAAS_TRIGGER => "faas.trigger",
+    GEN_AI_CONTEXT_UTILIZATION => "gen_ai.context.utilization",
+    GEN_AI_CONTEXT_WINDOW_SIZE => "gen_ai.context.window_size",
     GEN_AI_COST_INPUT_TOKENS => "gen_ai.cost.input_tokens",
     GEN_AI_COST_OUTPUT_TOKENS => "gen_ai.cost.output_tokens",
     GEN_AI_COST_TOTAL_TOKENS => "gen_ai.cost.total_tokens",