Python Firebase Admin SDK Listener sometimes throws Bad Gateway errors after DB is updated

db.reference(...).listen(exampleFunc) で使用される Python Realtime Database リスナーのパスと、データベース更新後に報告された requests.exceptions.HTTPError 502 のレスポンスから始めます。リスナーの設定と、利用可能なプロジェクト ID およびタイムスタンプをサーバー側のログと照合して確認します。再現可能な原因を特定するか、断続的な障害をどのように処理すべきかを文書化できれば完了です。

[READ] Step 1: Are you in the right place?

Yes

[REQUIRED] Step 2: Describe your environment

• Operating System version: cos-stable-101-17162-40-5
• Firebase SDK version: latest?
• Firebase Product: realtime database, admin SDK
• Python version: 3.8
• Pip version: latest?

[REQUIRED] Step 3: Describe the problem

I have a database with customers data in it. When a new customer is added, a Firebase function triggers and updates '' to [user.uid]: to represent credits in my system. I have a google cloud VM that has an admin sdk database listener setup. Every month or so, after a new customer signs up, all of my listeners will randomly throw an error. The error I am seeing is:
requests.exceptions.HTTPError: 502 Server Error: Bad Gateway for url: https://-default-rtdb.firebaseio.com/.json

I am using the realtime listener described in this stack overflow post top answer:
https://stackoverflow.com/questions/49863708/python-firebase-realtime-listener

Steps to reproduce:

Hard to reproduce, but I can also provide my project ID and exact times for the issue so that the Firebase team can look into server-side logs to see what the issue might be.

Relevant Code:

from firebase_admin import db
def exampleFunc(event):
    try:
        print(event)
    except Exception as e:
        return
 
#in startup function
listener1=db.reference('<listening location 1>').listen(exampleFunc)
listener2=db.reference('<listening location 2>').listen(exampleFunc)