From https://medium.com/@tetiana.matviichuk/dynamodb-streams-handy-and-tricky-as-well-2968b740a9b8

aws-resource-tags-example.yml

      Tags:
        - Key: Name
          Value: ${self:custom.analysis-tablename}
        - Key: Environment
          Value: ${self:custom.stage}
        - Key: Project
          Value: ${self:custom.app}
        - Key: Application
          Value: ${self:custom.service_acronym}

sls.yml

Resources:
  AnalysisMetadataTable:
    Type: AWS::DynamoDB::Table
    Properties:
      TableName: ${self:custom.analysis-tablename}
      AttributeDefinitions:
        - AttributeName: analysisRequestId
          AttributeType: S
        - AttributeName: requestorId
          AttributeType: S
      KeySchema:
        - AttributeName: analysisRequestId
          KeyType: HASH
      StreamSpecification:
        StreamViewType: NEW_IMAGE
      ProvisionedThroughput:
        ReadCapacityUnits: 10
        WriteCapacityUnits: 10
      GlobalSecondaryIndexes:
        - IndexName: requestorId-gsi
          KeySchema:
            - AttributeName: requestorId
              KeyType: HASH
          Projection:
            ProjectionType: ALL
          ProvisionedThroughput:
            ReadCapacityUnits: 5
            WriteCapacityUnits: 5
      Tags:
        - Key: Name
          Value: ${self:custom.analysis-tablename}
        - Key: Environment
          Value: ${self:custom.stage}
        - Key: Project
          Value: ${self:custom.app}
        - Key: Application
          Value: ${self:custom.service_acronym}