---
phase: 12-telemetry-heartbeat
verified: 2026-03-26T07:00:00Z
status: passed
score: 4/4 must-haves verified
re_verification: false
---

# Phase 12: Telemetry Heartbeat Verification Report

**Phase Goal:** Heartbeat reports checksum verification health per symbol with LOUD Telegram alerts on any integrity failure, and all checksum operations are logged locally for post-mortem
**Verified:** 2026-03-26T07:00:00Z
**Status:** passed
**Re-verification:** No — initial verification

## Goal Achievement

### Observable Truths

| #   | Truth                                                                                                        | Status     | Evidence                                                                                                                                                                                                                                                                                                          |
| --- | ------------------------------------------------------------------------------------------------------------ | ---------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| 1   | Heartbeat message includes a Checksum Health section showing per-symbol last verified date and failure count | ✓ VERIFIED | `formatter.py` lines 423-457: full Checksum Health section reads `checksum_per_symbol`, renders per-symbol `verified` count and `last_date`                                                                                                                                                                       |
| 2   | When all symbols have clean checksums, the section shows a single summary line (exception-only pattern)      | ✓ VERIFIED | `formatter.py` lines 433-438: `if failures_24h == "0"` renders single line `"{total_verified} files verified, latest {latest} — all clean"`                                                                                                                                                                       |
| 3   | Any checksum failure triggers a LOUD Telegram alert with symbol, date, expected hash, actual hash            | ✓ VERIFIED | `config.py` line 86: `checksum_ok` in `CRITICAL_KEYS` (LOUD persistent). `formatter.py` lines 440-457: failure detail renders truncated hashes. `tick_cache_seeder.py` lines 464-482: direct LOUD alert on max retries                                                                                            |
| 4   | All checksum operations (verify, skip, fail, retry) are appended to a local JSONL telemetry log              | ✓ VERIFIED | `checksum_telemetry.py`: `log_checksum_event()` writes `~/.cache/opendeviationbar/checksum-telemetry.jsonl`. Seeder calls: verify_pass (line 491), verify_fail (line 464), verify_retry (line 453), verify_skip (line 502). Sweep calls: sweep_pass (line 211), sweep_fail (line 221), sweep_skip (lines 159-185) |

**Score:** 4/4 truths verified

### Required Artifacts

| Artifact                                        | Expected                                                                  | Status     | Details                                                                                                                    |
| ----------------------------------------------- | ------------------------------------------------------------------------- | ---------- | -------------------------------------------------------------------------------------------------------------------------- |
| `python/opendeviationbar/checksum_telemetry.py` | Append-only JSONL telemetry log, exports `log_checksum_event`             | ✓ VERIFIED | 79 lines, substantive implementation; try/except wrapper ensures caller never crashes; `_LOG_PATH` correctly set           |
| `scripts/heartbeat/checks/checksum.py`          | Heartbeat check module reading ChecksumRegistry, exports `check_checksum` | ✓ VERIFIED | 121 lines; `check_checksum()` + `_check_checksum_inner()` + `_scan_recent_failures()`; all required results keys populated |

### Key Link Verification

| From                                   | To                                             | Via                                    | Status  | Details                                                                                                                                                                         |
| -------------------------------------- | ---------------------------------------------- | -------------------------------------- | ------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `scripts/heartbeat/checks/checksum.py` | `python/opendeviationbar/checksum_registry.py` | `ChecksumRegistry` import              | ✓ WIRED | Line 43: `from opendeviationbar.checksum_registry import ChecksumRegistry` (inside function, lazy import)                                                                       |
| `scripts/heartbeat/checks/__init__.py` | `scripts/heartbeat/checks/checksum.py`         | `check_checksum` in `run_checks()`     | ✓ WIRED | Line 10: top-level import. Line 267: `check_checksum(results)` called at end of `run_checks()`                                                                                  |
| `scripts/heartbeat/formatter.py`       | checksum results keys `checksum_*`             | results dict keys prefixed `checksum_` | ✓ WIRED | Lines 423-457: dedicated Checksum Health section reads `checksum_per_symbol`, `checksum_total_verified`, `checksum_failures_24h`, `checksum_failure_details`, `checksum_latest` |
| `scripts/tick_cache_seeder.py`         | `checksum_telemetry.log_checksum_event`        | import + 4 call sites                  | ✓ WIRED | Line 51: import. Lines 453, 464, 491, 502: verify_retry, verify_fail, verify_pass, verify_skip                                                                                  |
| `scripts/integrity_sweep.py`           | `checksum_telemetry.log_checksum_event`        | import + 7 call sites                  | ✓ WIRED | Line 38: import. Lines 159, 163, 168, 178, 185, 211, 221: sweep_skip (5x), sweep_pass, sweep_fail                                                                               |

### Data-Flow Trace (Level 4)

| Artifact                               | Data Variable           | Source                                                         | Produces Real Data                | Status    |
| -------------------------------------- | ----------------------- | -------------------------------------------------------------- | --------------------------------- | --------- |
| `scripts/heartbeat/checks/checksum.py` | `per_symbol`            | `ChecksumRegistry.query_by_symbol()` per symbol                | Yes — real registry records       | ✓ FLOWING |
| `scripts/heartbeat/checks/checksum.py` | `failures_24h`          | JSONL log scan (`_scan_recent_failures()`)                     | Yes — reads real log file         | ✓ FLOWING |
| `scripts/heartbeat/formatter.py`       | Checksum Health section | `checksum_per_symbol`, `checksum_failure_details` from results | Yes — populated by check_checksum | ✓ FLOWING |

### Behavioral Spot-Checks

Step 7b: SKIPPED — checks require live ClickHouse + ChecksumRegistry state on bigblack. Cannot verify without running server. Key imports are verifiable structurally (see Key Links above). Route to human verification for live execution.

### Requirements Coverage

| Requirement | Source Plan | Description                                                                                   | Status      | Evidence                                                                                                                                          |
| ----------- | ----------- | --------------------------------------------------------------------------------------------- | ----------- | ------------------------------------------------------------------------------------------------------------------------------------------------- |
| TELEM-01    | 12-01-PLAN  | Heartbeat includes checksum verification status per symbol (last verified date, any failures) | ✓ SATISFIED | `checksum.py` populates `checksum_per_symbol` with `{verified, last_date}` per symbol; formatter renders it                                       |
| TELEM-02    | 12-01-PLAN  | Checksum failure triggers LOUD Telegram alert with symbol, date, expected vs actual hash      | ✓ SATISFIED | `config.py`: `checksum_ok` in `CRITICAL_KEYS`; formatter renders `expected_hash[:16]` and `actual_hash[:16]`; seeder also sends direct LOUD alert |
| TELEM-04    | 12-01-PLAN  | Local telemetry log captures all checksum operations for post-mortem analysis                 | ✓ SATISFIED | `checksum_telemetry.py` JSONL at `~/.cache/opendeviationbar/checksum-telemetry.jsonl`; all 7 event types wired in seeder + sweep                  |

**TELEM-03** (`Phase 9`, not Phase 12): ChecksumRegistry as centralized verification registry — not claimed by this phase, not orphaned for Phase 12.

No orphaned requirements found. All three requirement IDs declared in plan frontmatter are satisfied.

### Anti-Patterns Found

| File                                   | Line | Pattern     | Severity | Impact                                                                                                                                           |
| -------------------------------------- | ---- | ----------- | -------- | ------------------------------------------------------------------------------------------------------------------------------------------------ |
| `scripts/heartbeat/checks/checksum.py` | 82   | `return []` | ℹ️ Info  | Early-return guard for missing telemetry file — legitimate control flow, not a stub. Function continues with full log-scan implementation below. |

No blockers or warnings found.

### Human Verification Required

#### 1. End-to-End Heartbeat Run on bigblack

**Test:** Run `python -m heartbeat` on bigblack with a live ClickHouse connection and populated ChecksumRegistry.
**Expected:** Telegram message includes "Checksum Health" section; clean state shows single summary line with total verified count and latest date.
**Why human:** Requires live ClickHouse + ChecksumRegistry populated from seeder runs; cannot test locally without full production environment.

#### 2. Failure Alert Path

**Test:** Inject a fake `verify_fail` entry into `~/.cache/opendeviationbar/checksum-telemetry.jsonl` with a timestamp within 24h, then trigger the heartbeat.
**Expected:** Heartbeat fires a LOUD Telegram alert (not silent) with failure detail showing symbol, date, and truncated hashes.
**Why human:** Requires Telegram bot token and chat ID to observe notification behavior; LOUD vs silent distinction not testable without live Telegram delivery.

### Gaps Summary

No gaps. All 4 observable truths are verified against actual code. The three required artifacts (telemetry module, check module, formatter section) exist, are substantive, and are fully wired. All three requirement IDs (TELEM-01, TELEM-02, TELEM-04) are satisfied with implementation evidence. Commits 2a12cbf, 3c5fd97, and 22519d1 exist in git history.

---

_Verified: 2026-03-26T07:00:00Z_
_Verifier: Claude (gsd-verifier)_
