Get Extractor Performance

Get feature extraction performance metrics.

Returns per-extractor execution metrics from the extraction_events ClickHouse table over the last hours (namespace-scoped), one row per (extractor_name, version):

• Total executions per extractor
• Average duration + P95/P99 latencies
• Success/failure counts and success rate

Returns an empty array when no extraction has run in the window or analytics is unavailable.

Example:

GET /v1/analytics/extractors/performance?hours=24
GET /v1/analytics/extractors/performance?extractor_name=text_extractor&hours=168