[raoufchebri]

Last November, we had several outages and have since directed much of our engineering efforts towards improving stability. During this phase, cold start latency regressed, but the root cause and magnitude were not immediately apparent to us. We made the call to continue working on stability and revisit the latency issue later.

Today, we want to share the story of tracking down and fixing that regression, which turned out to be in the Pageserver’s walredo mechanism.