diff --git a/src/fgai/dashboard.py b/src/fgai/dashboard.py
index ed0bf53..f2ccd92 100644
--- a/src/fgai/dashboard.py
+++ b/src/fgai/dashboard.py
@@ -298,6 +298,7 @@ async function refresh() {
   document.getElementById('profileSuggestions').innerHTML = visibleProfileSuggestions.length ? table(visibleProfileSuggestions, [
     {label:'Stream', key:'stream_name'},
     {label:'Events', key:'events'},
+    {label:'Type', render:r => esc(r.detected_log_type || (r.discovery || {}).log_type || '-')},
     {label:'Confidence', key:'confidence'},
     {label:'Advisor', render:r => esc((r.profile_advisor || {}).status || (advisor.enabled ? advisor.status : 'heuristic'))},
     {label:'Profile', render:r => r.profile_exists ? 'exists' : 'new'},
@@ -306,6 +307,7 @@ async function refresh() {
     {label:'Baseline fields', render:r => esc([...(r.categorical_fields || []), ...(r.numeric_fields || [])].slice(0,8).join(', ') || '-')},
     {label:'Detectors', render:r => esc(Object.keys(r.detectors || {}).join(', ') || '-')},
     {label:'Common denominators', render:r => esc((r.common_fields || []).slice(0,5).map(item => `${item.field} ${(item.coverage*100).toFixed(0)}%`).join(', ') || '-')},
+    {label:'Discovery', render:r => { const d=r.discovery || {}; const selected=d.selected_fields || {}; const top=(d.top_fields || []).slice(0,8).map(item => `${item.field} ${(Number(item.coverage || 0)*100).toFixed(0)}%/${item.unique_values}`).join(', '); const rejected=(d.rejected_fields || []).slice(0,8).map(item => `${item.field}: ${item.reason}`).join('; '); const reasons=(d.reasons || []).join('; '); return `<details><summary>${esc(d.field_count || 0)} fields analyzed</summary><p><b>Selected</b><br>Entity: ${esc((selected.entity || []).join(', ') || '-')}<br>Time: ${esc((selected.time || []).join(', ') || '-')}<br>Categorical: ${esc((selected.categorical || []).join(', ') || '-')}<br>Numeric: ${esc((selected.numeric || []).join(', ') || '-')}</p><p><b>Top fields</b><br>${esc(top || '-')}</p><p><b>Rejected</b><br>${esc(rejected || '-')}</p><p>${esc(reasons || '')}</p></details>`; }},
     {label:'Action', render:r => r.profile_exists ? '<button type="button" disabled>Applied</button>' : `<button type="button" class="apply-suggested-profile" data-stream-id="${esc(r.stream_id)}">Apply profile</button>`}
   ], 'profile-suggestions') : '<p class="muted">No missing stream profiles. Enable "show existing profiles" to inspect already configured profiles.</p>';
   const llmText = llm.text ? esc(llm.text).replace(/\\n/g, '<br>') : esc(llm.error || 'LLM assessment disabled or waiting for first run.');
diff --git a/src/fgai/profile_suggestions.py b/src/fgai/profile_suggestions.py
index 5d2079c..5dd660a 100644
--- a/src/fgai/profile_suggestions.py
+++ b/src/fgai/profile_suggestions.py
@@ -242,6 +242,77 @@ def _compact_windows_fields(fields: list[str]) -> list[str]:
     return output
 
 
+def _detected_log_type(stream_id: str, stream_name: str, coverage: Counter[str]) -> str:
+    name = f"{stream_id} {stream_name}".lower()
+    if _looks_like_windows_stream(stream_id, stream_name, coverage):
+        return "windows"
+    if any(token in name for token in ("fortigate", "firewall", "pan-os", "checkpoint", "iptables", "ufw")) or (
+        coverage["policyid"] and (coverage["dstip"] or coverage["dstport"]) and coverage["action"]
+    ):
+        return "firewall"
+    if any(token in name for token in ("dns", "adguard", "bind", "unbound")) or coverage["dns_query"] or coverage["query_domain"] or coverage["qh"]:
+        return "dns"
+    if any(token in name for token in ("squid", "proxy", "nginx", "apache", "iis", "web")) or coverage["url"] or coverage["request_uri"] or coverage["http_method"]:
+        return "web_proxy"
+    if any(token in name for token in ("audit", "app", "application", "serverlog", "prod")):
+        return "application"
+    return "unknown"
+
+
+def _field_stats(coverage: Counter[str], unique_values: dict[str, set[str]], numeric_counts: Counter[str], total: int) -> list[dict[str, object]]:
+    rows = []
+    for field, count in coverage.most_common():
+        if field in IGNORED_DISCOVERY_FIELDS:
+            continue
+        numeric_ratio = numeric_counts[field] / max(1, count)
+        rows.append({
+            "field": field,
+            "coverage": round(count / max(1, total), 2),
+            "unique_values": len(unique_values[field]),
+            "numeric_ratio": round(numeric_ratio, 2),
+        })
+    return rows
+
+
+def _rejected_fields(
+    coverage: Counter[str],
+    unique_values: dict[str, set[str]],
+    numeric_counts: Counter[str],
+    total: int,
+    selected_fields: set[str],
+    *,
+    limit: int = 12,
+) -> list[dict[str, object]]:
+    rejected = []
+    for field, count in coverage.most_common():
+        if len(rejected) >= limit:
+            break
+        coverage_ratio = count / max(1, total)
+        cardinality = len(unique_values[field])
+        reason = ""
+        if field in selected_fields:
+            continue
+        if field in IGNORED_DISCOVERY_FIELDS:
+            reason = "raw/internal field"
+        elif coverage_ratio < 0.1:
+            reason = "low coverage"
+        elif cardinality <= 1:
+            reason = "constant value"
+        elif cardinality > min(200, max(8, int(total * 0.7))):
+            reason = "too high cardinality"
+        elif numeric_counts[field] and numeric_counts[field] / max(1, count) < 0.95:
+            reason = "mixed numeric/text values"
+        else:
+            reason = "lower signal than selected fields"
+        rejected.append({
+            "field": field,
+            "reason": reason,
+            "coverage": round(coverage_ratio, 2),
+            "unique_values": cardinality,
+        })
+    return rejected
+
+
 def _generic_entity_fields(coverage: Counter[str], unique_values: dict[str, set[str]], total: int, selected: list[str]) -> list[str]:
     output = list(selected)
     for field, count in coverage.most_common():
@@ -376,6 +447,7 @@ def suggest_stream_profiles(events: list[LogEvent], *, existing_profiles: dict[s
 
         stream_name = names.get(stream_id, stream_id)
         is_windows = _looks_like_windows_stream(stream_id, stream_name, coverage)
+        log_type = _detected_log_type(stream_id, stream_name, coverage)
         entity_priority = WINDOWS_ENTITY_PRIORITY if is_windows else ENTITY_PRIORITY
         categorical_priority = WINDOWS_CATEGORICAL_PRIORITY if is_windows else CATEGORICAL_PRIORITY
         numeric_priority = WINDOWS_NUMERIC_PRIORITY if is_windows else NUMERIC_PRIORITY
@@ -433,6 +505,24 @@ def suggest_stream_profiles(events: list[LogEvent], *, existing_profiles: dict[s
             {"field": field, "coverage": round(count / max(1, total), 2), "unique_values": len(unique_values[field])}
             for field, count in coverage.most_common(12)
         ]
+        selected_fields = {timestamp, *entity_fields, *categorical, *numeric}
+        discovery = {
+            "log_type": log_type,
+            "field_count": len([field for field in coverage if field not in IGNORED_DISCOVERY_FIELDS]),
+            "selected_fields": {
+                "entity": entity_fields,
+                "time": [timestamp] if timestamp else [],
+                "categorical": categorical,
+                "numeric": numeric,
+            },
+            "top_fields": _field_stats(coverage, unique_values, numeric_counts, total)[:16],
+            "rejected_fields": _rejected_fields(coverage, unique_values, numeric_counts, total, selected_fields),
+            "reasons": [
+                f"detected {log_type} log pattern",
+                f"selected {len(entity_fields)} entity field(s), {len(categorical)} categorical field(s), and {len(numeric)} numeric field(s)",
+                "ignored raw/internal, constant, sparse, and very high-cardinality fields",
+            ],
+        }
         existing = existing_profiles.get(stream_id)
         score = min(100, 30 + len(entity_fields) * 15 + min(20, len(categorical) * 3) + min(15, len(detectors) * 5))
         suggestions.append({
@@ -448,6 +538,8 @@ def suggest_stream_profiles(events: list[LogEvent], *, existing_profiles: dict[s
             "numeric_fields": numeric,
             "detectors": detectors,
             "common_fields": high_coverage,
+            "discovery": discovery,
+            "detected_log_type": log_type,
             "profile": {
                 "stream_id": stream_id,
                 "name": f"{names.get(stream_id, stream_id)} recommended profile",
diff --git a/tests/test_profile_suggestions.py b/tests/test_profile_suggestions.py
index e070cfa..e44caa1 100644
--- a/tests/test_profile_suggestions.py
+++ b/tests/test_profile_suggestions.py
@@ -111,6 +111,29 @@ class ProfileSuggestionTests(unittest.TestCase):
         self.assertIn("workflow_state", profile["categorical_fields"])
         self.assertIn("risk_points", profile["numeric_fields"])
 
+    def test_profile_discovery_explains_selected_and_rejected_fields(self):
+        events = [
+            parse_log_line(
+                f"fgai_stream_id=app fgai_stream=BillingApp tenant_id=t{index % 4} actor_id=user{index % 7} "
+                f"workflow_state={'approved' if index % 2 else 'rejected'} request_id=req-{index} "
+                f"constant_field=same raw='{{json}}' risk_points={index % 9} created_at=2026-06-29T10:00:{index:02d}Z"
+            )
+            for index in range(1, 40)
+        ]
+
+        suggestion = suggest_stream_profiles(events)[0]
+        discovery = suggestion["discovery"]
+
+        self.assertEqual(suggestion["detected_log_type"], "application")
+        self.assertEqual(discovery["log_type"], "application")
+        self.assertIn("actor_id", discovery["selected_fields"]["entity"])
+        self.assertIn("workflow_state", discovery["selected_fields"]["categorical"])
+        self.assertIn("risk_points", discovery["selected_fields"]["numeric"])
+        rejected = {item["field"]: item["reason"] for item in discovery["rejected_fields"]}
+        self.assertEqual(rejected["raw"], "raw/internal field")
+        self.assertEqual(rejected["constant_field"], "constant value")
+        self.assertEqual(rejected["request_id"], "too high cardinality")
+
     def test_applies_valid_llm_advice_and_rejects_unknown_fields(self):
         suggestion = suggest_stream_profiles([
             parse_log_line("fgai_stream_id=windows fgai_stream=Windows username=alice hostname=host01 eventid=4625 action=failure")