Sticky disk attach failures in us-west

We are currently experiencing an issue in our us-west region where sticky disks are failing to attach. Sticky disks back several of our caching features, so customers running jobs in us-west may be affected across Docker container caching, Docker build caching, and Git repository caching. Affected jobs will still run, but will fall back to uncached behavior and may take longer than usual. Runners in other regions are unaffected. We are actively investigating and will post updates as we make progress.