diff --git a/harnesses/metadata-coverage/README.md b/harnesses/metadata-coverage/README.md
index 403feca4..1ac3850b 100644
--- a/harnesses/metadata-coverage/README.md
+++ b/harnesses/metadata-coverage/README.md
@@ -4,8 +4,6 @@
 
 Real-time monitoring tool for tracking blockchain data indexation latency across multiple aggregators.
 
-**[Live Dashboard](https://grafana-production-dc86.up.railway.app/)**
-
 </div>
 
 ## How It Works
diff --git a/harnesses/metadata-coverage/alertmanager/alertmanager.yml b/harnesses/metadata-coverage/alertmanager/alertmanager.yml
index 6ea7ebaa..c50fd32f 100644
--- a/harnesses/metadata-coverage/alertmanager/alertmanager.yml
+++ b/harnesses/metadata-coverage/alertmanager/alertmanager.yml
@@ -9,9 +9,13 @@ route:
   receiver: 'slack-webhook'
 
 receivers:
+  # Replace with your own Slack-bridge webhook URL before deploying.
+  # In your alertmanager container's entrypoint, run
+  #   envsubst < alertmanager.yml.tpl > alertmanager.yml
+  # so the value comes from the SLACK_WEBHOOK_URL env var, not the repo.
   - name: 'slack-webhook'
     webhook_configs:
-      - url: 'https://agent-slack-production.up.railway.app/webhook/grafana'
+      - url: 'https://example.invalid/your-slack-webhook'
         send_resolved: true
 
 inhibit_rules:
diff --git a/harnesses/metadata-coverage/monitoring/alertmanager.yml b/harnesses/metadata-coverage/monitoring/alertmanager.yml
index 77b9e263..c6a4492f 100644
--- a/harnesses/metadata-coverage/monitoring/alertmanager.yml
+++ b/harnesses/metadata-coverage/monitoring/alertmanager.yml
@@ -9,9 +9,13 @@ route:
   receiver: 'slack-webhook'
 
 receivers:
+  # Replace with your own Slack-bridge webhook URL before deploying.
+  # In your alertmanager container's entrypoint, run
+  #   envsubst < alertmanager.yml.tpl > alertmanager.yml
+  # so the value comes from the SLACK_WEBHOOK_URL env var, not the repo.
   - name: 'slack-webhook'
     webhook_configs:
-      - url: 'https://agent-slack-production.up.railway.app/webhook/grafana'
+      - url: 'https://example.invalid/your-slack-webhook'
         send_resolved: true
 
 inhibit_rules:
diff --git a/harnesses/metadata-coverage/prometheus/alertmanager.yml b/harnesses/metadata-coverage/prometheus/alertmanager.yml
index 77b9e263..c6a4492f 100644
--- a/harnesses/metadata-coverage/prometheus/alertmanager.yml
+++ b/harnesses/metadata-coverage/prometheus/alertmanager.yml
@@ -9,9 +9,13 @@ route:
   receiver: 'slack-webhook'
 
 receivers:
+  # Replace with your own Slack-bridge webhook URL before deploying.
+  # In your alertmanager container's entrypoint, run
+  #   envsubst < alertmanager.yml.tpl > alertmanager.yml
+  # so the value comes from the SLACK_WEBHOOK_URL env var, not the repo.
   - name: 'slack-webhook'
     webhook_configs:
-      - url: 'https://agent-slack-production.up.railway.app/webhook/grafana'
+      - url: 'https://example.invalid/your-slack-webhook'
         send_resolved: true
 
 inhibit_rules: