Understanding API Gateway Quotas

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swagger: '2.0'
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info:
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  title: test-api-gateway
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  description: Sample API on API Gateway with a Cloud Run backend
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  version: 1.0.0
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schemes:
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  - https
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produces:
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  - application/json
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x-google-backend:
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  address: https://some-api.run.app
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x-google-management:
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  metrics:
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    - name: "api-requests"
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      displayName: "API Requests"
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      valueType: INT64
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      metricKind: DELTA
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  quota:
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    limits:
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      - name: "request-limit"
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        metric: "api-requests"
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        unit: "1/min/{project}"
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        values:
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          STANDARD: 2
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paths:
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  /:
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    get:
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      summary: Cloud Run hello world
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      operationId: hello
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      x-google-quota:
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        metricCosts:
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          "api-requests": 1
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      responses:
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        '200':
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          description: A successful response
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          schema:
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            type: object
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            properties:
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              status:
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                type: string
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                example: "ok"
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              docs:
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                type: string
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                example: "/scalar"
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      security:
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        - api_key: []
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securityDefinitions:
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  api_key:
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    type: apiKey
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    name: key
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    in: query

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openapi: 3.0.3
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info:
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  title: test-api-gateway
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  description: Sample API on API Gateway with a Cloud Run backend
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  version: 1.0.0
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servers:
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  - url: /
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# Root-level API Management for OpenAPI 3.0 handles backends, metrics, and quotas
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x-google-api-management:
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  metrics:
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    - name: "api-requests"
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      displayName: "API Requests"
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      valueType: INT64
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      metricKind: DELTA
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  quota:
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    limits:
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      - name: "request-limit"
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        metric: "api-requests"
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        unit: "1/min/{project}"
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        values:
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          STANDARD: 2
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paths:
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  /:
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    get:
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      summary: Cloud Run hello world
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      operationId: hello
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      x-google-backend:
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        address: https://some-api.run.app
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      x-google-quota:
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        metricCosts:
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          "api-requests": 1
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      responses:
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        '200':
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          description: A successful response
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          content:
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            application/json:
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              schema:
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                type: object
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                properties:
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                  status:
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                    type: string
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                    example: "ok"
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                  docs:
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                    type: string
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                    example: "/scalar"
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      security:
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        - api_key: []
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components:
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  securitySchemes:
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    api_key:
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      type: apiKey
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      name: key
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      in: query