[
  {
    "external_tracker_format": "https://example-issues.com/{user}/{repo}/{index}",
    "external_tracker_regexp_pattern": "",
    "external_tracker_style": "numeric",
    "external_tracker_url": "https://example-issues.com"
  },
  {
    "external_tracker_format": "https://example-bugs.com/{user}/{repo}-{index}",
    "external_tracker_regexp_pattern": "",
    "external_tracker_style": "alphanumeric",
    "external_tracker_url": "https://example-bugs.com"
  },
  {
    "external_tracker_format": "https://custom-tracker.com/issue-{user}-{repo}-{index}",
    "external_tracker_regexp_pattern": "issue-(\\w+)-(\\w+)-(\\d+)",
    "external_tracker_style": "regexp",
    "external_tracker_url": "https://custom-tracker.com"
  }
]