实现单指标阈值告警触发

def solve():
    from pyodide.http import open_url
    from io import StringIO
    import pandas as pd
    st_csv = open_url(____).read()
    alerts_csv = open_url(____).read()
    st = pd.read_csv(StringIO(____))
    alerts = pd.read_csv(StringIO(____))
    ranges = {r['____']:(____) for _,r in st.iterrows()}
    def check_threshold(____):
        if metric not in ranges: return None
        lo, hi = ranges[metric]
        if value > hi: return {'____':'____','____':device_id,'____':metric,'____':value,'____':hi}
        if value < lo: return {'____':'____','____':device_id,'____':metric,'____':value,'____':lo}
        return None
    test_readings = [
        (____),(____),(____),
        (____),(____),
    ]
    print(____)
    for did, metric, value in test_readings:
        alert = check_threshold(____)
        if alert:
            print("____"+did+"____"+metric+"____"+str(____)+"____"+str(____))
        else:
            print("____"+did+"____"+metric+"____"+str(____))
    print("____"+str(len(____)))