pubsub subscription randomly didn't retry

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Given this subscription configurations we had 2 failed cloudfunctions handling 2 messages at the same moment we found out that 1 was retried and the other wasn't what could be the reason ?

Note: we have this subscription for a very long time and this is the first time and we didn't change the subscription configuration at all!

We suspected that:
1. It may be an issue the subscription configuration but we found out that there are simillar retries on Feb 4 (and even before that) for the exact same subscription using the exact same subscribed cloudfunction.
2. We also suspected that may be the *unretried* cloudfunction had different failure response that made the retry not possible and again it was a normal error like all other retries.

So, what could be the issue?

 

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I would suggest creating a support case for this inquiry, So that engineers can take a better look into your logs, subscriptions, API requests and etc. (some of these information might be dangerous to be posted publicly.)