docs: backport the single-region DR solution to 1.2 - #2870
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The section, its comparison table row and the second- or minute-level RTO wording landed in nightly only (#2804). Apart from those, the 1.2 overview was word for word the nightly one, so this brings the two back in step.
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killme2008
approved these changes
Sep 12, 2026
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The single-region DR section landed in nightly only (#2804), so 1.2's disaster recovery overview still jumps from Standalone straight to the cross-region topologies. This brings the two back in step.
What moves
DR solution based on single-region deployment in a single clustersectionsecond- or minute-levelRTO wording, which also applies to the cross-region row — without it 1.2's table would mixSecond or minute levelandMinute levelApart from those, the 1.2 overview was word for word the nightly one, so the two files are now identical.
Note on #2869
That PR swaps the DR diagrams to SVG, including in this same 1.2 file. The two do not overlap — #2869 edits the image reference lines, this one edits the frontmatter, inserts a section and edits the table — and I verified the branches auto-merge cleanly, so they can land in either order.
The new section's diagram is already
/Single-region-single-cluster.svg, which exists; the other eight stay.pnghere and become.svgwhen #2869 lands.Checks
DOC_LANG=en pnpm check:linkspassesDOC_LANG=zh pnpm check:linkspasses