promptfoo

This is my promptfoo config. Ive been trying to get latency to be an option under the metrics dropdown but I can't get the value.

# yaml-language-server: $schema=https://promptfoo.dev/config-schema.json
description: "Agent evaluation"

evaluateOptions:
  defaultGradingProvider:
    id: openai:bedrock-claude-4-5-sonnet-v1
    config:
      apiBaseUrl: LITELLM_API
      apiKey: LITELLM_API_KEY

prompts:
  - "{{input}}"

providers:
  - id: python:agent_provider.py

tests:
  - vars:
      input: "Hello"
    assert:
      # Basic metrics
      - type: javascript
        metric: latency_ms
        value: 'latencyMs'