fix: use absolute URL for insight Overview link and document known issues

KNOWN_ISSUES.md

@@ -0,0 +1,28 @@
+# Known Issues - Observability Homepage
+
+This document records known issues and design decisions for the consolidated Pigsty Observability Homepage.
+
+## 1. Dashboard Merging & Grid Positioning
+- **Status**: Fixed
+- **Issue**: Merging multiple source dashboards (`pigsty.json`, `node.json`, `k8s.json`) into one `homepage.json` originally caused panels to stack vertically regardless of their horizontal layout.
+- **Resolution**: `merge_dashboards.py` was updated to preserve the relative vertical and horizontal positioning within each newly created section (Infra Overview, Node, K8S Cluster).
+
+## 2. Variable Name Unification
+- **Status**: Fixed (Workaround)
+- **Issue**: The consolidated dashboard uses a unified variable set (`$hostname`, `$node`, etc.), but source queries in the Node dashboard expected `$name` and `$instance`.
+- **Resolution**: `merge_dashboards.py` performs a global regex replacement on the Node dashboard's JSON content before merging to align variable names.
+
+## 3. External Links in Dashlists
+- **Status**: Manual Override
+- **Issue**: Grafana `dashlist` panels only show internal dashboards with specific tags. They do not support external URL links (like the Insight Workbench).
+- **Resolution**: The "Apps" dashlist panel was replaced with a `text` panel using HTML to provide a direct link to `https://observability.svc.plus/insight/`.
+
+## 4. Root Path Redirection
+- **Status**: Fixed
+- **Issue**: Users visiting `observability.svc.plus/` were previously directed elsewhere (defaults in Caddyfile).
+- **Resolution**: Updated `Caddyfile` templates to redirect `/` (root) and `/zh` directly to `/grafana/`.
+
+## 5. Panel UID Scaling
+- **Status**: Potential Issue
+- **Issue**: Panel IDs are re-assigned sequentially (1, 2, 3...) during merging. This might break internal dashboard persistence if panels are re-added or deleted frequently.
+- **Recommendation**: Avoid frequent re-merging if persistent panel links are required.

files/grafana/homepage.json

@@ -1775,7 +1775,7 @@
       },
       "id": 5,
       "options": {
-        "content": "<div style='text-align: center; padding-top: 10px;'><a href='/insight/' style='font-size: 18px; color: #58a6ff; font-weight: bold;'>insight Overview</a></div>",
+        "content": "<div style='text-align: center; padding-top: 10px;'><a href='https://observability.svc.plus/insight/' style='font-size: 18px; color: #58a6ff; font-weight: bold;'>insight Overview</a></div>",
         "mode": "html"
       },
       "pluginVersion": "12.3.0",

merge_dashboards.py

@@ -83,7 +83,7 @@ def merge_dashboards():
             p["title"] = "insight Overview"
             p["type"] = "text"
             p["options"] = {
-                "content": "<div style='text-align: center; padding-top: 10px;'><a href='/insight/' style='font-size: 18px; color: #58a6ff; font-weight: bold;'>insight Overview</a></div>",
+                "content": "<div style='text-align: center; padding-top: 10px;'><a href='https://observability.svc.plus/insight/' style='font-size: 18px; color: #58a6ff; font-weight: bold;'>insight Overview</a></div>",
                 "mode": "html"
             }