[consensus/marshal] AncestorStream fetch duration histogram

[clabby]

Overview

Adds a histogram maintained by the Marshaled application wrapper that tracks the latency of a block fetched by the AncestorStream.

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Status	Name	Latest Commit	Updated (UTC)
✅ Deployment successful! View logs	commonware-mcp	ea55b21	May 22 2026, 09:40 PM

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Latest commit:	ea55b21
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Benchmark results

Tip

✅ PASSED: No benchmark exceeded the regression threshold.

Benchmark comparison table

Benchmark	Baseline (main)	Current	Delta	Threshold	Status
qmdb::merkleize/variant=any::unordered::fixed::mmr keys=10000 ch=false sync=false	1.625 ms	1.575 ms	-3.09%	10.00%	✅ PASS
qmdb::merkleize/variant=current::ordered::fixed::mmb chunk=256 keys=10000 ch=true sync=false	3.118 ms	3.018 ms	-3.23%	10.00%	✅ PASS

Baseline commit(s): 979d2a2f657f

[codecov]

Codecov Report

❌ Patch coverage is 99.50495% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 95.78%. Comparing base (2ac1695) to head (ea55b21).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
consensus/src/marshal/standard/inline.rs	90.90%	1 Missing ⚠️

@@           Coverage Diff           @@
##             main    #3832   +/-   ##
=======================================
  Coverage   95.77%   95.78%           
=======================================
  Files         486      486           
  Lines      201251   201349   +98     
  Branches     4876     4876           
=======================================
+ Hits       192754   192853   +99     
  Misses       6862     6862           
+ Partials     1635     1634    -1     

Files with missing lines	Coverage Δ
consensus/src/marshal/ancestry.rs	95.20% <100.00%> (+1.65%)	⬆️
consensus/src/marshal/coding/marshaled.rs	83.66% <100.00%> (+0.44%)	⬆️
consensus/src/marshal/core/mailbox.rs	91.86% <100.00%> (+0.08%)	⬆️
consensus/src/marshal/mocks/harness.rs	98.78% <100.00%> (+<0.01%)	⬆️
consensus/src/marshal/standard/deferred.rs	94.49% <100.00%> (+0.07%)	⬆️
consensus/src/marshal/standard/validation.rs	81.92% <100.00%> (+0.44%)	⬆️
consensus/src/marshal/standard/inline.rs	90.58% <90.90%> (-0.01%)	⬇️

... and 12 files with indirect coverage changes

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