diff --git a/scripts/publish_test_metrics.py b/scripts/publish_test_metrics.py
index 9a8a38d..72b5a7c 100644
--- a/scripts/publish_test_metrics.py
+++ b/scripts/publish_test_metrics.py
@@ -18,6 +18,9 @@ import urllib.request
 import xml.etree.ElementTree as ET
 from pathlib import Path
 
+SOURCE_SCAN_ROOTS = ("atlasbot", "scripts", "tests")
+SOURCE_EXTENSIONS = {".py", ".sh"}
+
 
 def _as_int(node: ET.Element, name: str) -> int:
     raw = node.attrib.get(name) or "0"
@@ -101,7 +104,25 @@ def _post_text(url: str, payload: str) -> None:
             raise RuntimeError(f"push failed status={resp.status}")
 
 
+def _count_source_files_over_limit(repo_root: Path, max_lines: int = 500) -> int:
+    count = 0
+    for rel_root in SOURCE_SCAN_ROOTS:
+        base = repo_root / rel_root
+        if not base.exists():
+            continue
+        for path in base.rglob("*"):
+            if not path.is_file():
+                continue
+            if path.suffix not in SOURCE_EXTENSIONS:
+                continue
+            lines = len(path.read_text(encoding="utf-8", errors="ignore").splitlines())
+            if lines > max_lines:
+                count += 1
+    return count
+
+
 def main() -> int:
+    repo_root = Path(__file__).resolve().parents[1]
     suite = os.getenv("SUITE_NAME", "atlasbot")
     pushgateway_url = os.getenv(
         "PUSHGATEWAY_URL", "http://platform-quality-gateway.monitoring.svc.cluster.local:9091"
@@ -112,6 +133,7 @@ def main() -> int:
 
     totals = _load_junit(junit_path)
     coverage_pct = _load_coverage_percent(coverage_path)
+    source_lines_over_500 = _count_source_files_over_limit(repo_root, max_lines=500)
     passed = max(totals["tests"] - totals["failures"] - totals["errors"] - totals["skipped"], 0)
     outcome = "ok" if totals["tests"] > 0 and totals["failures"] == 0 and totals["errors"] == 0 else "failed"
 
@@ -135,6 +157,10 @@ def main() -> int:
             f'atlasbot_quality_gate_tests_total{{suite="{suite}",result="skipped"}} {totals["skipped"]}',
             "# TYPE atlasbot_quality_gate_coverage_percent gauge",
             f'atlasbot_quality_gate_coverage_percent{{suite="{suite}"}} {coverage_pct:.3f}',
+            "# TYPE platform_quality_gate_workspace_line_coverage_percent gauge",
+            f'platform_quality_gate_workspace_line_coverage_percent{{suite="{suite}"}} {coverage_pct:.3f}',
+            "# TYPE platform_quality_gate_source_lines_over_500_total gauge",
+            f'platform_quality_gate_source_lines_over_500_total{{suite="{suite}"}} {source_lines_over_500}',
         ]
     ) + "\n"