Real-time queue metrics via Statistics API returning stale data in Kotlin

Trying to pull live queue stats (waiting count, agents available) using the Genesys Cloud Statistics API from our Android app. The goal is to update a UI indicator without polling the full conversation history. I’m hitting POST /api/v2/analytics/queues/observations/query with the queue ID and a simple date range filter.

Here’s the snippet handling the request:

val url = "https://api.mypurecloud.com/api/v2/analytics/queues/observations/query"
val body = """
    {
        "dateFrom": "2023-10-27T00:00:00Z",
        "dateTo": "2023-10-27T23:59:59Z",
        "queueIds": ["my-queue-id"]
    }
"""
val response = client.newCall(Request.Builder()
 .url(url)
 .method("POST", body.toRequestBody("application/json".toMediaType()))
 .header("Authorization", "Bearer $token")
 .build()).execute()

The response comes back with a 200 OK, but the metrics array is empty or shows data from an hour ago. I’ve checked the intervalId parameter and tried realtime, but nothing changes. Is there a specific groupBy or filter required for real-time data? The docs are vague on whether this endpoint supports true real-time or just near-real-time aggregation.

Also, am I missing a header for the Accept type? Tried application/json and application/vnd.genesis.v1+json with no luck. The SDK wrapper for Kotlin doesn’t seem to have a dedicated method for this specific real-time endpoint, so I’m rolling my own Retrofit call. Frustrating.