# Get performance leaderboard

Retrieves a ranked list of users by their feed operation performance for a specific operation. Can show either slowest or fastest users based on sort order.

RBAC:
- requires ANY of Jobs.Read, Jobs.Manage

Endpoint: GET /api/v1/admin/feed/metrics/slowest-users-single
Version: 1.0
Security: header

## Query parameters:

  - `limit` (integer)
    Maximum number of users to return (default: 10)
    Example: 10

  - `operation` (string, required)
    Feed operation to analyze
    Enum: "populate", "merge", "unmerge", "redis", "redisLex", "cache", "idsDb", "db", "add", "remove"

  - `sortDesc` (boolean)
    Sort in descending order - true for fastest users first, false for slowest users first (default: true)
    Example: true

  - `window` (string, required)
    Time window for performance analysis
    Enum: "TEN_MINUTES", "ONE_HOUR", "TWENTY_FOUR_HOURS"

## Response 200 fields (application/json):

  - `userId` (string, required)
    UUID with type prefix
    Example: "us_01hxcvk1hjexere4pvtrj0ymqq"

  - `averageTime` (number, required)

  - `totalMeasurements` (integer, required)

## Response 403 fields (application/json):

  - `errorCode` (string, required)
    Error code

  - `message` (string, required)
    Error message

  - `docUrl` (string)
    Link to documentation