docs: reflect real-world hub cost estimate ranges

[Michael Flanakin (flanakin)]

Summary

• Updates the FinOps hubs cost estimate note to reflect real-world ADX/Fabric pricing and calls out regional variance
• Addresses the gap reported in [Documentation] Update FinOps hub cost estimation #2229 (and previously ADX hub cost is around 300eu per month instead of expected 137$ #1719): the flat $120/$300 baseline understated actual cost for some regions/SKUs

Test plan

• Docs-only change — no build/deploy impact
• Review the updated cost estimate note for accuracy

Fixes #2229

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[Roland Krummenacher (RolandKrummenacher)]

Agreed the old figures were understated — thanks for picking up #2229. Two things before this lands.

This is one of four surfaces carrying these numbers, and the other three still say $120/$300/$5. Notably including the portal deploy UI, which is where most customers actually encounter the estimate:

• src/templates/finops-hub/createUiDefinition.json — line 97 ($120/mo for ADX), line 117 ($300/mo for F2), line 244 (~$5/mo per million), line 289, and the worked example on line 577 ($250/mo). None are in this diff.
• docs-mslearn/toolkit/power-bi/help-me-choose.md:52 — comparison table still reads Starts at $120 + ~$10 per $1M, Starts at $300, and ~$3-5 per $1M.
• docs/deploy/finops-hub-latest.ui.json — generated, so it follows once createUiDefinition.json is updated.

As it stands the docs and the deployment experience would quote different headline costs for the same thing.

The $15 figure contradicts the $10 in the same sentence — inline below.

Also worth confirming the calculator behind https://aka.ms/finops/hubs/calculator was refreshed, since the note sends people there for the detail.

[Roland Krummenacher (RolandKrummenacher)]

These two numbers can't both be right:

...plus $10 in Azure storage and processing cost per $1M being monitored. ... Cost without Data Explorer or Fabric is $15 per $1M.

The old pairing ($10 with Data Explorer, $5 without) was coherent — drop ADX, drop the ingestion-side cost. The new pairing has the no-ADX deployment costing more per $1M than the ADX deployment's incremental, which inverts that. One of the two has been updated and the other hasn't.

If $15 is the corrected storage + Data Factory figure, then the $10 here and in the headline on line 28 both need to move with it. Worth double-checking the number itself too — it's a 3-5x jump from the ~$3-5 per $1M quoted in help-me-choose.md:52.

Nit: dropping "(we estimate ~20GB per $1M)" removes the only handle a reader has for sanity-checking against their own data volume. Could it stay alongside the new "region" caveat rather than being swapped out for it?

[Roland Krummenacher (RolandKrummenacher)]

If the per-$1M figure is being revised (see the note on line 30 — the body now says $15 without Data Explorer while this line and the next still say $10), this headline needs to move in step. Right now a reader gets $10 here, $10 in the first half of the note, and $15 in the second half.

[microsoft-github-policy-service]

@Michael Flanakin (@flanakin): you have some new feedback!

Please review and resolve all comments and I'll let reviewers know by removing the Needs: Attention label. If I miss anything, just reply with #needs-review and I'll update the status.