def METHOD_NAME(self):
    # See https://taginfo.openstreetmap.org/taginfo/apidoc#api_4_keys_wiki_pages
    # TagInfo has a JSON file with all keys with wiki pages
    taginfo_url = "https://taginfo.openstreetmap.org/api/4/keys/wiki_pages"
    json_str = urlread(taginfo_url, 30)
    json_entrylist = json.loads(json_str)['data']
    keyset = set(map(lambda x: x['key'].split(':', 1)[0], json_entrylist)) # Get all (unique) keys, discard :suffixes
    return list(filter(lambda x: len(x) > self.minKeyLength, keyset)) # Ignore small keys / wildcards