As per the Google Cloud Status Dashboard [1], there is no known load balancer issue in Europe currently. However, the issue may be isolated to your projects or instances, or it may be impacting a limited number of customers; hence, it is not listed on the dashboard [2].
It is worth mentioning that Google Groups is a place for non-technical how-to questions (where you're likely to find information like service status updates and release notes, and ranging from book recommendations to creative shortcuts) [3].
Since it appears that you found an indication of a potential load balancer issue, I would recommend you to report [4] the issue with Issue Trackers with all the details [5] (omitting PII/sensitive information).
On a different note, if you have any technical questions in future, you may consider reaching out to Stack Exchange sites [6] (e.g. Server Fault [7] or Stack Overflow [8]) where Google also participates that can help you find answers or troubleshoot problems.