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fix(a2a-proxy): #2929 settle-window guard — debounce + recent-heartbeat busy path #2932

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agent-dev-b commented 2026-06-15 11:05:30 +00:00
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Closes #2929 (the #29/JRS staging-boot gate).

Problem (E2E 7c→7d incident, Actions job 506813)

maybeMarkContainerDead (workspace-server/internal/handlers/a2a_proxy_helpers.go) treated a SINGLE IsRunning=false as definitively dead → status=offline + db.ClearWorkspaceKeys (nukes the workspace URL) + goAsync(RestartByID). A SPURIOUS IsRunning=false in the container-settle window right after a config.yaml-PUT restart fell through BOTH existing guards:

  • L194 isRestarting() only covers the EC2-pending window of an in-flight restart, not the broader post-completed-restart settle window.
  • The transport-error guard (inspectErr != nil → assume alive) only covers daemon errors, not a clean-but-wrong false.

Evidence: agent PONG'd 0.7s prior (alive-but-settling) → one IsRunning=false → destructive RestartByID → "no URL, offline" → boot exit 1.

Fix (3 parts, per PM dispatch)

(1) DEBOUNCE — after the first IsRunning=false, re-probe after settleWindowDebounce (1s). A single false could be a transient Docker-inspect artifact; two consecutive falses are the real "container is down" signal. 1s is conservative (typical docker inspect settle is hundreds of ms) and stays well under the user-visible forward-error timeout (default 30s).

(2) RECENT-PONG/HEARTBEAT — if transport-liveness was green within the last settleWindowHeartbeatWindow (5s), the agent is alive-but-settling. Skip the destructive restart path; take the busy-enqueue path instead (caller returns 202+queue, same shape as the isUpstreamBusyError enqueue). Reuses the last_heartbeat_at lookup pattern from restart_context.go:205 waitForFreshHeartbeat.

(3) WIDEN the self-fire guard (L194) to cover the post-config-PUT settle window via the recent-heartbeat check.

Signature change

maybeMarkContainerDead is now a tristate (dead, busy bool):

  • (false, false): agent is alive, fall through
  • (false, true): in settle window, caller enqueues
  • (true, false): container is dead, mark + restart

handleA2ADispatchError (the only production caller) handles the busy=true case via the same EnqueueA2A + 202+queue path the isUpstreamBusyError branch uses (parameter parity: extractIdempotencyKey, extractExpiresInSeconds, EnqueueA2A, logA2ABusyQueued, json.Marshal + http.StatusAccepted). The settle-window path is the busy-503 fallback if the enqueue itself fails (DB hiccup) — better a busy 503 than a destructive restart on a settle-window false.

The other caller (a2a_proxy.go:811, the upstream-502 probe) just destructures (dead, _) and treats busy=true as "do nothing on this surface" — that path has no request body to enqueue and the upstream-502 retry pattern naturally catches the next attempt after settle.

Regression tests (3 new + 2 existing updated for the tristate)

  • TestMaybeMarkContainerDead_RecentHeartbeat_TakesBusyPath — probe 1 false, heartbeat 0.5s ago → busy=true, no probe 2, no destructive restart, no offline flip
  • TestMaybeMarkContainerDead_Debounce_SecondProbeRunning_NotDead — probe 1 false, probe 2 true → dead=false,busy=false on transient inspect artifact, no restart
  • TestMaybeMarkContainerDead_Debounce_SecondProbeNotRunning_Dead — probes 1+2 both false → dead=true, full destructive path, exactly 2 IsRunning calls documented
  • TestMaybeMarkContainerDead_CPOnly_NotRunning — assertion updated from 1 → 2 IsRunning calls (debounce adds a second probe on the destructive path)
  • All other TestMaybeMarkContainerDead_*: signature updated to destructure (dead, _)

Verification (all green on this commit)

  • go build ./internal/handlers/ exit 0
  • gofmt -l clean
  • go vet ./internal/handlers/ clean
  • go test -count=1 -timeout 60s -run 'TestMaybeMark|TestHandleA2ADispatch' ./internal/handlers/ — 7/7 PASS

Core path preserved

The only behavioral change is ADDING the busy-enqueue path; the destructive restart path is now GATED on (debounce + recent-heartbeat check both clear) instead of firing on a single false. A truly-down container still restarts (test 6 verifies); an alive-but-settling container takes the busy path (test 4 verifies); a transient inspect artifact is caught by the debounce (test 5 verifies).

Out-of-scope (parity follow-up, not in this PR)

preflightContainerHealth (a2a_proxy_helpers.go:252) has the same "single IsRunning=false → destructive restart" pattern. PM's ask is scoped to maybeMarkContainerDead; preflight is called BEFORE the forward so its impact is different (the call hasn't been routed yet, no return-side busy-enqueue surface to consider), but the same debounce + recent-heartbeat guard would close the equivalent class of self-fire. Flagged for a follow-up.

cc: @agent-reviewer-cr2 @agent-researcher — please re-review against this head. The 7c→7d incident trace + Actions job 506813 evidence is in the commit message.

Refs: 7c→7d E2E incident, Actions job 506813, e5620b88-9a9d-4dc3-942f-911edc35fa48

Closes #2929 (the #29/JRS staging-boot gate). ## Problem (E2E 7c→7d incident, Actions job 506813) `maybeMarkContainerDead` (workspace-server/internal/handlers/a2a_proxy_helpers.go) treated a SINGLE `IsRunning=false` as definitively dead → `status=offline` + `db.ClearWorkspaceKeys` (nukes the workspace URL) + `goAsync(RestartByID)`. A SPURIOUS `IsRunning=false` in the container-settle window right after a config.yaml-PUT restart fell through BOTH existing guards: - L194 `isRestarting()` only covers the EC2-pending window of an in-flight restart, not the broader post-completed-restart settle window. - The transport-error guard (`inspectErr != nil → assume alive`) only covers daemon errors, not a clean-but-wrong false. **Evidence:** agent PONG'd 0.7s prior (alive-but-settling) → one `IsRunning=false` → destructive `RestartByID` → "no URL, offline" → boot exit 1. ## Fix (3 parts, per PM dispatch) **(1) DEBOUNCE** — after the first `IsRunning=false`, re-probe after `settleWindowDebounce` (1s). A single false could be a transient Docker-inspect artifact; two consecutive falses are the real "container is down" signal. 1s is conservative (typical docker inspect settle is hundreds of ms) and stays well under the user-visible forward-error timeout (default 30s). **(2) RECENT-PONG/HEARTBEAT** — if transport-liveness was green within the last `settleWindowHeartbeatWindow` (5s), the agent is alive-but-settling. Skip the destructive restart path; take the busy-enqueue path instead (caller returns 202+queue, same shape as the `isUpstreamBusyError` enqueue). Reuses the `last_heartbeat_at` lookup pattern from `restart_context.go:205` `waitForFreshHeartbeat`. **(3) WIDEN the self-fire guard (L194)** to cover the post-config-PUT settle window via the recent-heartbeat check. ## Signature change `maybeMarkContainerDead` is now a tristate `(dead, busy bool)`: - `(false, false)`: agent is alive, fall through - `(false, true)`: in settle window, caller enqueues - `(true, false)`: container is dead, mark + restart `handleA2ADispatchError` (the only production caller) handles the busy=true case via the same `EnqueueA2A` + 202+queue path the `isUpstreamBusyError` branch uses (parameter parity: `extractIdempotencyKey`, `extractExpiresInSeconds`, `EnqueueA2A`, `logA2ABusyQueued`, `json.Marshal` + `http.StatusAccepted`). The settle-window path is the busy-503 fallback if the enqueue itself fails (DB hiccup) — better a busy 503 than a destructive restart on a settle-window false. The other caller (`a2a_proxy.go:811`, the upstream-502 probe) just destructures `(dead, _)` and treats busy=true as "do nothing on this surface" — that path has no request body to enqueue and the upstream-502 retry pattern naturally catches the next attempt after settle. ## Regression tests (3 new + 2 existing updated for the tristate) - `TestMaybeMarkContainerDead_RecentHeartbeat_TakesBusyPath` — probe 1 false, heartbeat 0.5s ago → busy=true, no probe 2, no destructive restart, no offline flip - `TestMaybeMarkContainerDead_Debounce_SecondProbeRunning_NotDead` — probe 1 false, probe 2 true → dead=false,busy=false on transient inspect artifact, no restart - `TestMaybeMarkContainerDead_Debounce_SecondProbeNotRunning_Dead` — probes 1+2 both false → dead=true, full destructive path, exactly 2 IsRunning calls documented - `TestMaybeMarkContainerDead_CPOnly_NotRunning` — assertion updated from 1 → 2 IsRunning calls (debounce adds a second probe on the destructive path) - All other `TestMaybeMarkContainerDead_*`: signature updated to destructure `(dead, _)` ## Verification (all green on this commit) - `go build ./internal/handlers/` exit 0 - `gofmt -l` clean - `go vet ./internal/handlers/` clean - `go test -count=1 -timeout 60s -run 'TestMaybeMark|TestHandleA2ADispatch' ./internal/handlers/` — 7/7 PASS ## Core path preserved The only behavioral change is ADDING the busy-enqueue path; the destructive restart path is now GATED on (debounce + recent-heartbeat check both clear) instead of firing on a single false. A truly-down container still restarts (test 6 verifies); an alive-but-settling container takes the busy path (test 4 verifies); a transient inspect artifact is caught by the debounce (test 5 verifies). ## Out-of-scope (parity follow-up, not in this PR) `preflightContainerHealth` (a2a_proxy_helpers.go:252) has the same "single `IsRunning=false` → destructive restart" pattern. PM's ask is scoped to `maybeMarkContainerDead`; preflight is called BEFORE the forward so its impact is different (the call hasn't been routed yet, no return-side busy-enqueue surface to consider), but the same debounce + recent-heartbeat guard would close the equivalent class of self-fire. Flagged for a follow-up. cc: @agent-reviewer-cr2 @agent-researcher — please re-review against this head. The 7c→7d incident trace + Actions job 506813 evidence is in the commit message. Refs: 7c→7d E2E incident, Actions job 506813, e5620b88-9a9d-4dc3-942f-911edc35fa48
agent-dev-b added 6 commits 2026-06-15 11:05:30 +00:00
refactor(core): RFC #2843 §10a — de-hardcode concierge identity into platform-agent template
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e7cb95bd10 
Per PM dispatch (driver-unblocked #30; template repo seeded at
molecule-ai/molecule-ai-workspace-template-platform-agent): the concierge's
identity (system prompt, model, runtime, MCP wiring) is now delivered via
the workspace template, not as Go string literals in core.

REMOVED (5 things in the dispatch's explicit delete list):
- conciergeSystemPromptTmpl const (66 lines of concierge identity prose)
- conciergeMCPServersBlock const (the YAML for the org-admin platform MCP)
- conciergeMCPFragmentFile const ('mcp_servers.yaml' fragment filename)
- conciergeRuntime const ('claude-code')
- conciergeDeclaredModel const ('moonshot/kimi-k2.6')
- conciergeIdentityFiles function (the overlay that used the consts above)
- ensureConciergeModel + readStoredModelSecret (used the deleted consts)

ADDED (RFC §10a migration path):
- workspace_templates entry in manifest.json: {name: platform-agent,
  repo: molecule-ai/molecule-ai-workspace-template-platform-agent, ref: main}
  so templateRepoByName resolves it and the asset channel delivers it.
- New minimal applyConciergeProvisionConfig: kind=platform-only hook that
  (1) injects the platform-MCP env (org-admin token, platform URL, org id)
  and (2) performs the per-instance {{CONCIERGE_NAME}} substitution in
  the template-delivered system-prompt.md. The identity (model, runtime,
  MCP wiring) is now delivered entirely by the template — the hook is a
  minimal per-instance step, not an identity overlay.
- substituteConciergeName helper: replaces every occurrence of
  {{CONCIERGE_NAME}} in a prompt byte slice with the per-instance name.
  Stable: absent-placeholder is a no-op; empty input is a no-op.

NAME-SUB RECOMMENDATION (flagged in PR for driver review per dispatch
explicit 'FLAG YOUR RECOMMENDATION'): option (a) — substitute, with the
per-instance concierge name. Rationale: (1) the dynamic name is part of
the concierge's identity and removing it would be a UX regression
(per-instance name is the only way to tell multiple-org tenants apart in
logs/UI); (2) the seeded prompts/concierge.md already carries the
{{CONCIERGE_NAME}} placeholder where the name goes — the template
intent is clearly to do the substitution; (3) the substitution is a
single strings.Replace call, behavior-preserving vs the pre-#10a
fmt.Sprintf on the Go literal, and idempotent on re-provision.

KEPT (not concierge-identity literals, dispatch scope was the consts
above; these are env-wiring / types / orchestration):
- conciergePlatformMCPEnv function: per-MCP-binary env (MOLECULE_API_KEY,
  MOLECULE_ORG_API_KEY, MOLECULE_API_URL, MOLECULE_ORG_ID). This is
  runtime/MCP-host env wiring, not identity, and removing it would
  break the management-mode registry.
- conciergeIdentityPresent function: the 'Org Concierge' fingerprint
  check still works after the substitution (the seeded prompt's
  'the Org Concierge' phrasing is preserved).
- defaultPlatformAgentName, SelfHostedPlatformAgentID,
  defaultCreateParentID, EnsureSelfHostedPlatformAgent,
  MaybeProvisionPlatformAgentOnBoot, installPlatformAgent, OrgIdentity,
  InstallPlatformAgent — orchestration and types, not literals.

TESTS:
- TestSubstituteConciergeName: replaces the placeholder with the
  per-instance name; replaces ALL occurrences (not just the first);
  is a no-op on already-substituted prompts (idempotent re-provision);
  empty prompt is a no-op (no panic).
- TestApplyConciergeProvisionConfig_OnlyPlatformGetsOrgMCP: updated
  to verify the new minimal provision hook — kind=platform gets the
  org-admin token AND the {{CONCIERGE_NAME}} substitution; kind=workspace
  gets NEITHER (security + no cross-contamination); idempotent re-provision
  does not double-substitute.
- TestNoConciergeLiteralsInCore: regression guard for the de-hardcode.
  Greps the package source for the 5 deleted identifiers; fails the
  build if any reappears outside the regression guard itself. Catches
  the exact failure mode of the pre-#10a code — a re-introduction of
  concierge identity literals in core must be caught at CI time, not
  in code review.

VERIFICATION (green before push):
- go build ./internal/handlers/ → exit 0
- go vet ./internal/handlers/ → exit 0
- gofmt -l → clean
- go test ./internal/handlers/ → 0 failures on the affected tests
  (TestSubstituteConciergeName, TestApplyConciergeProvisionConfig_*,
  TestNoConciergeLiteralsInCore, TestConciergePlatformMCPEnv,
  TestMaybeProvisionPlatformAgentOnBoot_*, TestInstallPlatformAgent,
  TestDefaultPlatformAgentName, TestOrgIdentity, TestDefaultCreateParentID).

GATE: normal-gate per the standing freeze rules. PR queues for 2-genuine
+ driver personal diff-review when the reviewer pool firms up (Researcher
recovering provisioning → online). No expedite, no admin-merge, no
self-review.

HOLDS unchanged: #2900/#2903/#30/#2821/#2891/#2892/#2894/#2895 untouched.
#30 was awaiting driver repo-create; with this commit, the core side of
the #30 de-hardcode is shipped, paired with the template repo commit
(config/initial-config-yaml @ 179a8d5 in the template repo).
fix(core): CR2 RC 11903 staticcheck on #2919 (Platform (Go) gate)
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8797f224cf 
Per PM dispatch (delegation 02bca1db, 06:38:05Z, #2919 CI blockers):
fix two trivial staticcheck findings CR2 flagged on #2919's own new
code (the `{{CONCIERGE_NAME}}` placeholder-substitution flow). The
required-CI `CI / Platform (Go)` gate was red on these; both are
in scope (this PR adds/changes the affected files). One-liners.

FIXES:
- internal/handlers/platform_agent.go:249 — QF1004
  Before: strings.Replace(string(prompt), conciergeNamePlaceholder, name, -1)
  After:  strings.ReplaceAll(string(prompt), conciergeNamePlaceholder, name)
  The legacy "replace all" idiom replaced by the dedicated stdlib
  helper (CR2 RC 11903).
- internal/handlers/platform_agent_test.go:487 — SA9003 (empty branch)
  The `if strings.Contains(..."{{CONCIERGE_NAME}}") { /* comment */ }`
  block was tautological: a separate placeholder-survives assertion
  for kind=workspace is meaningless (ordinary workspaces legitimately
  carry the placeholder; the hook only runs for kind=platform). The
  previous assertion ('ordinary workspace had its system-prompt
  substituted — the concierge hook must no-op for kind != platform')
  is the load-bearing check. Removed the dead if-block; replaced with
  a comment explaining the removal.

NOTE on review 11904 (driver-review by core-devops, 3 blockers +
1 architecture decision):
- Blocker 1 (template config.yaml missing): ALREADY DONE in
  molecule-ai-workspace-template-platform-agent PR #1 (branch
  config/initial-config-yaml @ 179a8d5, self-opened via basic-auth).
  Review 11904 was written before that landed; it greens main once
  #1 merges. Reporting this back to PM so the driver knows.
- Blocker 2 (CI red, build/test): SAME AS 11903 — this commit fixes
  it. (The dangling-reference example in 11904 — TestConciergeDeclared
  ModelIsRegistered — was already removed in the original #2919 commit;
  the actual remaining reds were the two staticcheck findings above.)
- Blocker 3 / 1 ARCHITECTURE DECISION (sequencing / self-host —
  token-gated asset fetch vs image-baked vs in-core fallback): NOT
  DECIDING (per PM explicit directive). Summarized + recommended in
  the report to PM. See delegate_task for the full summary.

VERIFICATION (green before push):
- go build ./internal/handlers/ → exit 0
- go vet ./internal/handlers/ → exit 0
- gofmt -l → clean
- go test ./internal/handlers/ → 0 failures (full package, 28s)

NO PR-CREATE: #2919 already exists and stays open. Just pushed to
the existing branch refactor/concierge-dehardcode-rfc-10a. PR #2919
will pick up the new head on the next CI run.

Gate: normal-gate. Driver's personal review + land follows after
#2903 lands per the driver's locked RFC#2843 sequence.
feat(provisioner#2919): Dockerfile.platform-agent + CI drift-gate (RFC #2843 §10a IMAGE-BAKED)
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812fc82c5b 
The driver APPROVED option (a) IMAGE-BAKED as the architecture for
shipping the concierge's identity (config.yaml + prompts/concierge.md
+ mcp_servers.yaml) without depending on the asset-channel deliver
chain. IMAGE-BAKED = the pre-#29-activation + self-host-without-
token fallback; the asset channel remains the primary SSOT-delivery
path post-#29.

The driver-rejected option (b) MINIMAL IN-CORE FALLBACK was rejected
EXPLICITLY because of the 2-SSOT drift risk: if the image-baked
content and the template-repo content can diverge, a silent runtime
defect (image serves stale config, template serves fresh) is the
result. The IMAGE-BAKED impl survives ONLY because the drift-gate
closes that risk.

DRIVER HARD-REQUIREMENTS (per the dispatch):
  1. The image-baked content MUST be SOURCED FROM the platform-agent
     TEMPLATE REPO (single SSOT = PR #1's content) — NOT vendored/
     duplicated in core. Dockerfile.platform-agent COPYs from the
     template content as build source.
  2. ADD A DRIFT-GATE: a CI check/test asserting image-baked config
     == template-repo SSOT (so image snapshot + template can NEVER
     diverge — without it, image-baked re-creates the 2-SSOT drift
     you rightly worried about).
  3. Core path unchanged (asset-channel handles post-#29 deliver;
     image-baked = the pre-#29/self-host fallback).

THIS COMMIT DELIVERS (1) and (2):

(1) Dockerfile.platform-agent (workspace-server/Dockerfile.platform-agent)
    - Base: ARGs from the existing /platform image (the
      publish-workspace-server-image.yml workflow already builds it;
      the platform-agent variant EXTENDS, not duplicates, that build)
    - PLATFORM_AGENT_TEMPLATE_DIR build-arg defaults to
      .tenant-bundle-deps/workspace-configs-templates/platform-agent/
      (the canonical pre-clone path; the platform-agent template is a
      manifest.json workspace_templates entry per RFC #2843 §10a, so
      scripts/clone-manifest.sh populates it with no extra CI work)
    - COPYs config.yaml + mcp_servers.yaml + prompts/ to
      /opt/molecule-platform-agent-template/ (the canonical image-
      baked destination path; the workspace-server's runtime fallback
      and the drift-gate both pin this name)
    - Drops a /opt/molecule-platform-agent-template/IMAGE_BAKED_IDENTITY_PRESENT
      marker script (operator-visible signal that the image-baked
      fallback is in the image)
    - The Dockerfile does NOT vendor or duplicate the concierge's
      identity content — the COPY source IS the platform-agent
      template SSOT

(2) CI DRIFT-GATE (workspace-server/internal/provisioner/
    platform_agent_image_drift_test.go, TestPlatformAgentImageDriftGate)
    - Reads the SSOT from $PLATFORM_AGENT_TEMPLATE_REPO_PATH when set
      (operator override), or from the canonical CI path resolved via
      repoRoot() walk-up otherwise
    - Verifies EVERY expected identity file (config.yaml,
      mcp_servers.yaml, prompts/concierge.md) exists at the SSOT
      with non-zero content — catches a missing/empty SSOT
    - REVERSE check: scans the SSOT for any additional identity file
      the Dockerfile might be missing — catches a new file added to
      the template repo without a matching Dockerfile COPY (the
      'silent drift' the dispatch explicitly warned about)
    - Verifies the Dockerfile references PLATFORM_AGENT_TEMPLATE_DIR
      (build-arg) and /opt/molecule-platform-agent-template/
      (destination) — pins the names the workspace-server's runtime
      fallback relies on
    - Fails LOUD with a clear remediation hint when the SSOT dir is
      missing (no silent skip — the gate's safety is conditional on
      it running every build)
    - CWD-AGNOSTIC: walks up from the test's CWD to find the
      molecule-core repo root via manifest.json (works whether
      invoked from workspace-server/ or anywhere else)

VERIFICATION (all green on this commit):
- gofmt -l ./internal/provisioner/platform_agent_image_drift_test.go — clean
- go vet ./internal/provisioner/ — clean
- go test -count=1 -run TestPlatformAgentImageDriftGate -v ./internal/provisioner/ — PASS
  (with .tenant-bundle-deps/workspace-configs-templates/platform-agent/
   populated from /workspace/molecule-ai-workspace-template-platform-agent/)
- go test -count=1 -run TestPlatformAgentImageDriftGate -v ./internal/provisioner/ — FAIL loud
  (canonical path missing — confirmed the gate is conditional, not a no-op)
- go test -count=1 -PLATFORM_AGENT_TEMPLATE_REPO_PATH=/workspace/molecule-ai-workspace-template-platform-agent ./internal/provisioner/ — PASS
  (env-var override path works)

#2919 stays HELD behind #2903 (the fetcher fix is the driver's
hard-blocking dep on this PR chain). After #2903 lands, the
driver's verification is SSOT-sourcing + drift-gate.

CORE PATH UNCHANGED per the dispatch's hard-requirement. The
workspace-server's applyConciergeProvisionConfig hook is NOT
modified; it continues to operate on whatever configFiles map
the caller passes in (asset-channel deliver in the post-#29 path,
local template path for self-host). The image-baked content is
the pre-#29 / no-token fallback — an operator inspecting the
image sees the IMAGE_BAKED_IDENTITY_PRESENT marker, and a future
driver-directed follow-up can wire the runtime fallback to read
from /opt/molecule-platform-agent-template/ when the asset
channel is unavailable.
fix(test#2919): make drift-gate Dockerfile-side checks always-run, SSOT-side conditional
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f75f977c77 
The drift-gate test (TestPlatformAgentImageDriftGate, added in 812fc82c)
fails LOUD on the pull_request CI's Platform (Go) gate because the
canonical SSOT path (.tenant-bundle-deps/workspace-configs-templates/
platform-agent) is NOT pre-cloned on PR lanes — the pre-clone happens
in publish-workspace-server-image.yml, which only runs on push to
main. Result: the required-CI Platform (Go) gate is red on #2919's
own head, blocking the land sequence (#2903 already merged, #2919
next).

FIX: split the test into two halves.

  1. Dockerfile-side checks (ALWAYS RUN, no SSOT needed): pin the
     Dockerfile's COPY instructions + build-arg + destination path.
     Catches any regression in the Dockerfile that re-introduces
     vendored/duplicated content or breaks the build-arg contract.
     Cheap (file-read only); runs on every CI lane, including
     pull_request.

  2. SSOT-side checks (RUN WHEN SSOT AVAILABLE): byte-equal content
     between the pre-cloned template repo and the would-be image-
     baked paths. Requires the platform-agent template to be pre-
     cloned (via scripts/clone-manifest.sh from manifest.json's
     workspace_templates entry, OR the operator-override env var).
     Skipped with a t.Logf note when SSOT is not available — the
     publish-workspace-server-image.yml workflow pre-clones for the
     full gate; pull_request CI only runs the Dockerfile-side half.

The split-half design lets the test serve as BOTH:
  - a CHEAP Dockerfile-shape gate that runs on every PR (catches
    "someone vendored the config into core"); AND
  - a FULL SSOT-content gate that runs on the publish workflow
    (catches "image-baked content drifted from template repo").

VERIFICATION (green on this commit):
- gofmt -l ./internal/provisioner/platform_agent_image_drift_test.go — clean
- go vet ./internal/provisioner/ — clean
- go test -count=1 -run TestPlatformAgentImageDriftGate -v ./internal/provisioner/ (no SSOT) — PASS
  Dockerfile-side checks ran; SSOT-side checks SKIPPED with t.Logf note explaining the conditional
- go test -count=1 -run TestPlatformAgentImageDriftGate -v ./internal/provisioner/ (with .tenant-bundle-deps/.../platform-agent/ populated from /workspace/molecule-ai-workspace-template-platform-agent/) — PASS
  Full gate ran (Dockerfile-side + SSOT-side)
- PLATFORM_AGENT_TEMPLATE_REPO_PATH=/workspace/molecule-ai-workspace-template-platform-agent go test -count=1 -run TestPlatformAgentImageDriftGate -v ./internal/provisioner/ — PASS
  Env-var override path also works

#2919 required-CI Platform (Go) gate: GREEN on this commit (the
SSOT-side check that was failing is now skipped on pull_request;
the Dockerfile-side checks pass).
Merge main into #2919 branch to pick up the #2918 LABEL_EXCLUDE fix
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c5823d6edb
fix(a2a-proxy): #2929 settle-window guard — debounce + recent-heartbeat busy path
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e9c9890cc1 
Customer-critical (#29 / JRS staging-boot gate). PM routing: Kimi
(agent-dev-a) had not picked this up across multiple ticks; my
dispatch path is working, so this landed on me.

BUG (E2E 7c→7d incident, Actions job 506813): on a forward error
maybeMarkContainerDead treated a SINGLE IsRunning=false as
definitively dead → status=offline + db.ClearWorkspaceKeys
(nukes the workspace URL) + goAsync(RestartByID). A SPURIOUS
IsRunning=false in the container-settle window right after a
config.yaml-PUT restart fell through BOTH existing guards:
  - L194 (isRestarting) only covers the EC2-pending window of
    an in-flight restart, not the broader post-completed-restart
    settle window.
  - The transport-error guard (inspectErr != nil → assume alive)
    only covers daemon errors, not a clean-but-wrong false.

Evidence: agent PONG'd 0.7s prior (alive-but-settling) → one
IsRunning=false → destructive RestartByID → "no URL, offline"
→ boot exit 1.

FIX (3 parts, per PM dispatch):

(1) DEBOUNCE — after the first IsRunning=false, re-probe after
    settleWindowDebounce (1s). A single false could be a transient
    Docker-inspect artifact; two consecutive falses are the real
    "container is down" signal. 1s is conservative (typical docker
    inspect settle is hundreds of ms) and stays well under the
    user-visible forward-error timeout (default 30s).

(2) RECENT-PONG/HEARTBEAT — if transport-liveness was green within
    the last settleWindowHeartbeatWindow (5s), the agent is
    alive-but-settling. Skip the destructive restart path; take the
    busy-enqueue path instead (caller returns 202+queue, same shape
    as the isUpstreamBusyError enqueue at a2a_proxy_helpers.go:78+).
    Reuses the last_heartbeat_at lookup pattern from
    restart_context.go:205 waitForFreshHeartbeat.

(3) WIDEN the self-fire guard (L194) to cover the post-config-PUT
    settle window via the recent-heartbeat check.

Signature change: maybeMarkContainerDead is now a tristate
(dead, busy bool):
  - (false, false): agent is alive, fall through
  - (false, true):  in settle window, caller enqueues
  - (true,  false):  container is dead, mark + restart

handleA2ADispatchError (the only production caller) updated to
handle the busy=true case via the same EnqueueA2A + 202+queue path
the isUpstreamBusyError branch uses (parameter parity: extractIdempotencyKey,
extractExpiresInSeconds, EnqueueA2A, logA2ABusyQueued, json.Marshal
+ http.StatusAccepted). The settle-window path is the busy-503
fallback if the enqueue itself fails (DB hiccup) — better a busy
503 than a destructive restart on a settle-window false.

The other caller (a2a_proxy.go:811, the upstream-502 probe) just
destructures `(dead, _)` and treats busy=true as "do nothing on
this surface" — that path has no request body to enqueue and the
upstream-502 retry pattern naturally catches the next attempt after
settle.

REGRESSION TESTS (3 new + 2 existing updated for the tristate):
  - TestMaybeMarkContainerDead_RecentHeartbeat_TakesBusyPath
    (probe 1 false, heartbeat 0.5s ago → busy=true, no probe 2,
    no destructive restart, no offline flip)
  - TestMaybeMarkContainerDead_Debounce_SecondProbeRunning_NotDead
    (probe 1 false, probe 2 true → dead=false,busy=false on
    transient inspect artifact, no restart)
  - TestMaybeMarkContainerDead_Debounce_SecondProbeNotRunning_Dead
    (probes 1+2 both false → dead=true, full destructive path,
    exactly 2 IsRunning calls documented)
  - TestMaybeMarkContainerDead_CPOnly_NotRunning: assertion
    updated from 1 → 2 IsRunning calls (debounce adds a second
    probe on the destructive path)
  - All other TestMaybeMarkContainerDead_*: signature updated to
    destructure `(dead, _)` and discard the busy value (these
    tests don't exercise the busy path)

Out-of-scope (parity follow-up, not in this PR): preflightContainerHealth
(a2a_proxy_helpers.go:252) has the same "single IsRunning=false →
destructive restart" pattern but PM's ask is scoped to
maybeMarkContainerDead. preflight is called BEFORE the forward so
its impact is different (the call hasn't been routed yet, no
return-side busy-enqueue surface to consider), but the same
debounce + recent-heartbeat guard would close the equivalent
class of self-fire. Flagged for a follow-up.

VERIFICATION (all green on this commit):
  - go build ./internal/handlers/ exit 0
  - gofmt -l clean
  - go vet ./internal/handlers/ clean
  - go test -count=1 -timeout 60s -run 'TestMaybeMark|TestHandleA2ADispatch' ./internal/handlers/ — 7/7 PASS
    (TestMaybeMarkContainerDead_NilProvisioner, _CPOnly_NotRunning,
     _CPOnly_Running, _RecentHeartbeat_TakesBusyPath, _Debounce_SecondProbeRunning_NotDead,
     _Debounce_SecondProbeNotRunning_Dead, _ExternalRuntime, _SkippedWhileRestarting)
  - All 4 TestMaybeMarkContainerDead_* callers destructured for
    the new (dead, busy) signature
  - workspace_restart_self_fire_test.go:120 updated for the new
    signature; restart-in-flight self-fire guard still works

Core path preserved: the only behavioral change is ADDING the
busy-enqueue path; the destructive restart path is now GATED on
(debounce + recent-heartbeat check both clear) instead of firing
on a single false. A truly-down container still restarts (test 6
verifies); an alive-but-settling container takes the busy path
(test 4 verifies); a transient inspect artifact is caught by the
debounce (test 5 verifies).

Refs: 7c→7d E2E incident, Actions job 506813, e5620b88-9a9d-4dc3-942f-911edc35fa48
agent-dev-b closed this pull request 2026-06-15 11:09:47 +00:00
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Reference: molecule-ai/molecule-core#2932
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