实现存储空间不足告警

def solve():
    from pyodide.http import open_url
    from io import StringIO
    import pandas as pd
    hb_csv = open_url(____).read()
    scr_csv = open_url(____).read()
    hb = pd.read_csv(StringIO(____))
    screens = pd.read_csv(StringIO(____))
    WARN_MB = ____; CRIT_MB = ____
    latest = hb.sort_values(____).groupby(____).last().reset_index()
    merged = latest.merge(____)
    alerts = []
    for _, row in merged.iterrows():
        free = int(____); total = int(____)
        level = '____' if free < CRIT_MB else '____' if free < WARN_MB else '____'
        if level != '____':
            alerts.append({'____':row['____'],'____':level,'____':free,'____':round(____)})
    print(____)
    for a in alerts[:____]:
        print("____"+a['____'].upper()+"____"+a['____']+"____"+str(____)+"____"+str(____)+"____")
    print("____"+str(len(____))+"____"+str(len(____))+"____")