{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "title": "AIStatusDashboard Metrics Row",
  "type": "object",
  "required": [
    "timestamp",
    "provider_id",
    "metric",
    "sample_count"
  ],
  "properties": {
    "timestamp": { "type": "string", "format": "date-time" },
    "provider_id": { "type": "string" },
    "metric": {
      "type": "string",
      "enum": [
        "latency_p50_ms",
        "latency_p95_ms",
        "latency_p99_ms",
        "first_token_latency_ms",
        "http_429_rate",
        "http_5xx_rate",
        "tokens_per_sec",
        "stream_disconnect_rate"
      ]
    },
    "value": { "type": ["number", "null"] },
    "sample_count": { "type": "number" },
    "sources": { "type": "string" }
  }
}