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## Problem Compute is not always able to reconnect to pages server. First of all it caused by long time of restart of pageserver. So number of attempts is increased from 5 (hardcoded) to 60 (GUC). Also we do not perform flush after each command to increase performance (it is especially critical for prefetch). Unfortunately such pending flush makes it not possible to transparently reconnect to restarted pageserver. What we can do is to try to minimzie such probabilty. Most likely broken connection will be detected in first sens command after some idle period. This is why max_flush_delay parameter is added which force flush to be performed after first request after some idle period. See #4497 ## Summary of changes Add neon.max_reconnect_attempts and neon.max_glush_delay GUCs which contol when flush has to be done and when it is possible to try to reconnect to page server ## Checklist before requesting a review - [ ] I have performed a self-review of my code. - [ ] If it is a core feature, I have added thorough tests. - [ ] Do we need to implement analytics? if so did you add the relevant metrics to the dashboard? - [ ] If this PR requires public announcement, mark it with /release-notes label and add several sentences in this section. ## Checklist before merging - [ ] Do not forget to reformat commit message to not include the above checklist