Implement Monlet MVP stack and UI updates

deploy/showcase/agents/dead.toml

@@ -0,0 +1,24 @@
+hostname = "agent-dead"
+state_dir = "/var/lib/monlet-agent"
+
+[labels]
+scenario = "dead"
+role = "showcase"
+
+[server]
+enabled = true
+url = "http://server:8000"
+token = "monlet-dev-token"
+heartbeat_interval = "5s"
+batch_interval = "3s"
+
+[metrics]
+enabled = false
+listen = "127.0.0.1:9465"
+
+[[checks]]
+id = "ok_check"
+name = "Dead agent placeholder check"
+command = "/opt/monlet/checks/exit_0.sh"
+interval = "10s"
+timeout = "3s"

deploy/showcase/agents/mixed.toml

@@ -0,0 +1,46 @@
+hostname = "agent-mixed"
+state_dir = "/var/lib/monlet-agent"
+
+[labels]
+scenario = "mixed-status"
+role = "showcase"
+
+[server]
+enabled = true
+url = "http://server:8000"
+token = "monlet-dev-token"
+heartbeat_interval = "5s"
+batch_interval = "3s"
+
+[metrics]
+enabled = true
+listen = "0.0.0.0:9465"
+
+[[checks]]
+id = "ok_check"
+name = "Showcase ok"
+command = "/opt/monlet/checks/exit_0.sh"
+interval = "5s"
+timeout = "3s"
+
+[[checks]]
+id = "warning_check"
+name = "Showcase warning"
+command = "/opt/monlet/checks/exit_1.sh"
+interval = "5s"
+timeout = "3s"
+
+[[checks]]
+id = "critical_check"
+name = "Showcase critical (permanent webhook fail)"
+command = "/opt/monlet/checks/exit_2.sh"
+interval = "5s"
+timeout = "3s"
+dedupe_key = "agent-mixed:critical:fail"
+
+[[checks]]
+id = "unknown_check"
+name = "Showcase unknown"
+command = "/opt/monlet/checks/exit_3.sh"
+interval = "5s"
+timeout = "3s"

deploy/showcase/agents/prometheus_owned.toml

@@ -0,0 +1,25 @@
+hostname = "agent-prometheus-owned"
+state_dir = "/var/lib/monlet-agent"
+
+[labels]
+scenario = "prometheus-owned"
+role = "showcase"
+
+[server]
+enabled = true
+url = "http://server:8000"
+token = "monlet-dev-token"
+heartbeat_interval = "5s"
+batch_interval = "3s"
+
+[metrics]
+enabled = false
+listen = "127.0.0.1:9465"
+
+[[checks]]
+id = "promcheck"
+name = "Prometheus-owned critical (no outbox expected)"
+command = "/opt/monlet/checks/exit_2.sh"
+interval = "5s"
+timeout = "3s"
+notifications_enabled = false

deploy/showcase/agents/resolve.toml

@@ -0,0 +1,25 @@
+hostname = "agent-resolve"
+state_dir = "/var/lib/monlet-agent"
+
+[labels]
+scenario = "resolve"
+role = "showcase"
+
+[server]
+enabled = true
+url = "http://server:8000"
+token = "monlet-dev-token"
+heartbeat_interval = "5s"
+batch_interval = "3s"
+
+[metrics]
+enabled = false
+listen = "127.0.0.1:9465"
+
+[[checks]]
+id = "flapping"
+name = "Flapping check (critical then ok)"
+command = "/opt/monlet/checks/flapping.sh"
+interval = "5s"
+timeout = "3s"
+dedupe_key = "agent-resolve:flapping:retry"

deploy/showcase/agents/spool_replay.toml

@@ -0,0 +1,24 @@
+hostname = "agent-spool-replay"
+state_dir = "/var/lib/monlet-agent"
+
+[labels]
+scenario = "spool-replay"
+role = "showcase"
+
+[server]
+enabled = true
+url = "http://server:8000"
+token = "monlet-dev-token"
+heartbeat_interval = "5s"
+batch_interval = "3s"
+
+[metrics]
+enabled = false
+listen = "127.0.0.1:9465"
+
+[[checks]]
+id = "replay_check"
+name = "Spool replay check"
+command = "/opt/monlet/checks/replay_check.sh"
+interval = "3s"
+timeout = "2s"

deploy/showcase/agents/stale.toml

@@ -0,0 +1,24 @@
+hostname = "agent-stale"
+state_dir = "/var/lib/monlet-agent"
+
+[labels]
+scenario = "stale"
+role = "showcase"
+
+[server]
+enabled = true
+url = "http://server:8000"
+token = "monlet-dev-token"
+heartbeat_interval = "5s"
+batch_interval = "3s"
+
+[metrics]
+enabled = false
+listen = "127.0.0.1:9465"
+
+[[checks]]
+id = "ok_check"
+name = "Stale agent placeholder check"
+command = "/opt/monlet/checks/exit_0.sh"
+interval = "10s"
+timeout = "3s"

deploy/showcase/checks/exit_0.sh

@@ -0,0 +1,3 @@
+#!/bin/sh
+echo "ok: $(date -u +%FT%TZ)"
+exit 0

deploy/showcase/checks/exit_1.sh

@@ -0,0 +1,3 @@
+#!/bin/sh
+echo "warning: degraded"
+exit 1

deploy/showcase/checks/exit_2.sh

@@ -0,0 +1,3 @@
+#!/bin/sh
+echo "critical: probe failed"
+exit 2

deploy/showcase/checks/exit_3.sh

@@ -0,0 +1,3 @@
+#!/bin/sh
+echo "unknown: probe returned unexpected exit code"
+exit 3

deploy/showcase/checks/flapping.sh

@@ -0,0 +1,8 @@
+#!/bin/sh
+# critical until /state/resolve.flag exists, then ok.
+if [ -f /state/resolve.flag ]; then
+  echo "ok: resolve flag present"
+  exit 0
+fi
+echo "critical: waiting for resolve flag"
+exit 2

deploy/showcase/checks/replay_check.sh

@@ -0,0 +1,3 @@
+#!/bin/sh
+echo "ok: replay tick"
+exit 0

deploy/showcase/mock_webhook.py

@@ -0,0 +1,69 @@
+#!/usr/bin/env python3
+"""Mock webhook for showcase/e2e.
+
+Decides response status by substring in incident.incident_key from request body:
+- contains 'retry' -> 503 (retryable failure)
+- contains 'fail'  -> 400 (permanent failure)
+- otherwise        -> 200 (success)
+"""
+
+from __future__ import annotations
+
+import json
+import sys
+from http.server import BaseHTTPRequestHandler, ThreadingHTTPServer
+
+
+def _classify(body: bytes) -> int:
+    try:
+        data = json.loads(body or b"{}")
+    except Exception:
+        return 200
+    incident = data.get("incident") or {}
+    key = str(incident.get("incident_key") or "")
+    if "retry" in key:
+        return 503
+    if "fail" in key:
+        return 400
+    return 200
+
+
+class Handler(BaseHTTPRequestHandler):
+    def do_POST(self) -> None:  # noqa: N802
+        length = int(self.headers.get("Content-Length") or 0)
+        body = self.rfile.read(length) if length else b""
+        code = _classify(body)
+        self.send_response(code)
+        self.send_header("Content-Type", "text/plain")
+        self.send_header("Content-Length", "0")
+        self.end_headers()
+        try:
+            data = json.loads(body or b"{}")
+            inc = (data.get("incident") or {})
+            print(
+                f"webhook {code} event_type={data.get('event_type')!r} "
+                f"incident_key={inc.get('incident_key')!r}",
+                flush=True,
+            )
+        except Exception:
+            print(f"webhook {code} (unparsable body, {length}B)", flush=True)
+
+    def log_message(self, *_args: object) -> None:
+        return
+
+
+def main() -> int:
+    addr = ("0.0.0.0", 8080)
+    srv = ThreadingHTTPServer(addr, Handler)
+    print(f"mock_webhook listening on {addr[0]}:{addr[1]}", flush=True)
+    try:
+        srv.serve_forever()
+    except KeyboardInterrupt:
+        pass
+    finally:
+        srv.server_close()
+    return 0
+
+
+if __name__ == "__main__":
+    sys.exit(main())

deploy/showcase/seed_discarded.sql

@@ -0,0 +1,16 @@
+-- Seed one outbox row with an unknown notifier name so the worker marks it 'discarded'.
+-- Attached to any existing incident; if none exists yet the script is a no-op.
+INSERT INTO notification_outbox
+    (id, incident_id, notifier, event_type, state, attempts, next_attempt_at, payload)
+SELECT
+    gen_random_uuid(),
+    i.id,
+    'showcase-unknown',
+    'firing',
+    'pending',
+    0,
+    now(),
+    '{"showcase":"discarded"}'::jsonb
+FROM incidents i
+ORDER BY i.opened_at DESC
+LIMIT 1;