Discussion at https://github.com/codecov/support/issues/105

codecov.yml

codecov:
  token: uuid  # Your private repository token
  url: "http"  # for Codecov Enterprise customers
  slug: "owner/repo"  # for Codecov Enterprise customers
  branch: master  # override the default branch
  bot: username  # set user whom will be the consumer of oauth requests
  ci:  # Custom CI domains if Codecov does not identify them automatically
    - ci.domain.com
    - !provider  # ignore these providers when checking if CI passed
                 # ex. You may test on Travis, Circle, and AppVeyor, but only need
                 # to check if Travis passes. Therefore add: !circle and !appveyor
  notify: # ADVANCED USE ONLY
    after_n_builds: null      # number of expected builds to recieve before sending notifications
                              # after: check ci status unless disabled via require_ci_to_pass
    require_ci_to_pass: yes   # yes: will delay sending notifications until all ci is finished
                              # no: will send notifications without checking ci status and wait till "after_n_builds" are uploaded
    countdown: null           # number of seconds to wait before first ci build check
    delay: null               # number of seconds to wait between ci build checks

coverage:
  precision: 2  # 2 = xx.xx%, 0 = xx%
  round: down|up|nearest # default down
  range: 50...60 # default 70...90. red...green

  notify:
    irc:
      default:
        server: "chat.freenode.net"|encrypted
        branches: null  # all branches by default
        threshold: 1%
        message: "Coverage {{changed}} for {{owner}}/{{repo}}"  # customize the message
        flags: null
        paths: null

    slack:
      default:
        url: "http"|encrypted
        threshold: 1%
        branches: null  # all branches by default
        message: "Coverage {{changed}} for {{owner}}/{{repo}}"  # customize the message
        attachments: "sunburst, diff"
        only_pulls: false
        flags: null
        paths: null

    email:
      default:
        to:
          - example@domain.com
          - &author
        threshold: 1%
        only_pulls: false
        layout: header, diff, trends
        flags: null
        paths: null

    hipchat:
      default:
        url: "http"|encrypted
        room: name|id
        threshold: 1%
        token: encrypted
        branches: null  # all branches by default
        notify: false  # if the hipchat message is silent or loud (default false)
        message: "Coverage {{changed}} for {{owner}}/{{repo}}"  # customize the message
        flags: null
        paths: null

    gitter:
      url: "http"|encrypted
      threshold: 1%
      branches: null  # all branches by default
      message: "Coverage {{changed}} for {{owner}}/{{repo}}"  # customize the message

    webhooks:
      _name_:
        url: "http"|encrypted
        threshold: 1%
        branches: null  # all branches by default

  status:
    project:
      default:
        against: parent
        target: auto
        threshold: 1%
        branches:
          - master
        if_no_uploads: error
        if_not_found: success
        if_ci_failed: error
        only_pulls: false
        flags:
          - integration
        paths:
          - folder

    patch:
      default:
        against: parent
        target: 80%
        branches: null
        if_no_uploads: success
        if_not_found: success
        if_ci_failed: error
        only_pulls: false
        flags:
          - integration
        paths:
          - folder
    
    changes:
      default:
        against: parent
        branches: null
        if_no_uploads: error
        if_not_found: success
        if_ci_failed: error
        only_pulls: false
        flags:
          - integration
        paths:
          - folder

  flags:
    integration:
      branches:
        - master
      ignore:
        - app/ui

  ignore: # files and folders for processing
    - tests/*
  
  fixes:
    - "old_path::new_path"

comment:
  layout: header, diff, trends, uncovered
  branches: *
  behavior: default # defualt = posts once then update, posts new if delete
                    # once = post once then updates
                    # new = delete old, post new
                    # spammy = post new

default.codecov.yml

# This file represents the default values when a customer has not filled them out
coverage:
  precision: 2
  round: down
  range: "70...100"
  notify:
    require_ci_to_pass: yes

  status:
    project: yes

    patch: yes

    changes: yes

comment:
  layout: "header, diff, changes"
  behavior: default