Extra links supported for operators coming from third-party packages:

airflow.serialization.serialized_objects.BUILTIN_OPERATOR_EXTRA_LINKS

tests/core/test_providers_manager.py
'mssql',
    'mysql',
    'odbc',
    'oracle',
    'pig_cli',
    'postgres',
    'presto',
    'redis',
    'snowflake',
    'sqlite',
    'tableau',
    'vertica',
    'wasb',
]
class TestProviderManager(unittest.TestCase):
    def test_providers_are_loaded(self):
        provider_manager = ProvidersManager()
        provider_list = list(provider_manager.providers.keys())
        
        for provider in provider_list:
            package_name = provider_manager.providers[provider][1]['package-name']
            version = provider_manager.providers[provider][0]
            self.assertRegex(version, r'[0-9]*\.[0-9]*\.[0-9]*.*')
            self.assertEqual(package_name, provider)
        self.assertEqual(ALL_PROVIDERS, provider_list)
    def test_hooks(self):
        provider_manager = ProvidersManager()
        connections_list = list(provider_manager.hooks.keys())
        self.assertEqual(CONNECTIONS_LIST, connections_list)