pubsub subscription randomly didn't retry

Google Cloud Data Analytics
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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?

2

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.)