Cache the server-scoped watermark read across a runner's lifetime (#4197) - #4399

Cache the server-scoped watermark read across a runner's lifetime (#4197)#4399

erikdarlingdata merged 10 commits into

deverikdarlingdata/PerformanceMonitor:devfrom

fix/4197-cached-watermarkerikdarlingdata/PerformanceMonitor:fix/4197-cached-watermarkCopy head branch name to clipboard