Week 39 · 2026

Highlights

5 PRs merged, 7 others opened and 47 commits across two repos, with no releases. Two issues were opened and closed within the week: #2876, fixed by the node bump below, and #2886, the acknowledgement-signature problem #2884 addressed, closed along with it. One merge is last week's test migration; the other four are a cardano-node bump, a fix to how the node decides its network is backed up, a new delegated-head demo, and a changelog tidy. The seven other PRs were all closed unmerged before the week ended.

Reactive. The test migration described last week (#2875) merged Monday.

cardano-node moved from 11.0.1 to 11.1.2 (#2877, merged Wednesday, closes #2876), on the suspicion that the old version was behind a nightly failure. The demo docker-compose image, which had been left on 10.6.2, was bumped too. The same PR scaled the 900-second per-test timeout by the same 3x factor as the Blockfrost waits, which had been cutting a nightly Blockfrost test off early, and fixed a flaky "reports a stalled broadcast" test, which now scrapes metrics with retries.

The node's network outbox reported BacklogFull at a fixed 1000 pending messages, so under constant load a node refused NewTx while its network was still draining normally. In the end-to-end benchmarks each refused transaction then invalidated every later one in its client's chain ("All inputs are spent"), which is why the sustained-load and plateau scenarios had been failing on master. The outbox now also judges the backlog by how long it would take to drain at the recent completion rate, and reports BacklogFull only once that exceeds noProgressFor; the depth cap stays as a memory backstop, raised from 1000 to 10000 (#2889, merged Friday).

A new delegated-head demo (#2888, merged Friday) runs a head whose operators commit no funds of their own: two independent addresses increment funds into it, transact, and leave by decrement. One of them builds its deposit transaction in JS and submits it straight to L1, to show the hydra-node API isn't required for depositing. It runs with nix run .#delegated-demo. The changelog was also tidied (#2887, Thursday).

Seven stacked PRs (#2878 to #2884), four on rollback handling and three on snapshot refusals, acknowledgement signatures and a deviating-party model, were opened Wednesday and closed Thursday and Friday without merging.

KPI & Outcome Achievement (M6). Routine only: the W38 note published.