实现跨区告警汇总与优先级排序

def solve():
    from pyodide.http import open_url
    from io import StringIO
    import pandas as pd
    alerts_csv = open_url(____).read()
    alerts = pd.read_csv(StringIO(____))
    PRIORITY = {'____':____,'____':____,'____':____,'____':____}
    alerts = alerts.copy()
    alerts['____'] = alerts['____'].map(____).fillna(____)
    sorted_alerts = alerts.sort_values(____)
    print(____)
    for level, grp in alerts.groupby(____):
        print("____"+level+"____"+str(len(____))+"____")
    print(____)
    for _, row in sorted_alerts.iterrows():
        print(____)