docs: draft MySQL snapshot parallelism page - #38091
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User-facing draft for the parallel snapshot feature: how key ranges divide across workers, single-column string PK requirement and fallback, upstream connection and statistics considerations, and where to observe progress. Marked private preview.
…ance Make the MySQL page strictly MySQL-specific (split eligibility, prefix-based partitioning, connection counts) and move the cross-source worker-scaling discussion into a shared snapshotting parallelism include on the snapshotting concept page and the ingest overview. Add a troubleshooting section on telling whether the upstream database is the bottleneck (CPU, IOPS, throughput, connections, cache, replica lag) and what to do about it. Present the feature as production, without a preview banner. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018yzDA9ywnCLXweNCzqBm12
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Part of SS-358.
Adding docs for the new MySQL parallel snapshotting feature, some more context on the load we place on upstream databases, and some high-level debugging tips for triaging obvious database issues.
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