feat(watchdog): 主机侧巡检定时器按异常邮件通知平台所有者，operator 增加 phase 与 build_info 指标、卡死存活探针与告警规则

cmd/felis/watchdog_test.go

@@ -0,0 +1,42 @@
+package main
+
+import (
+	"context"
+	"net"
+	"strings"
+	"testing"
+)
+
+// TestProxyFinding: a listening proxy is healthy; a closed port is the critical
+// "players cannot reach any server" finding.
+func TestProxyFinding(t *testing.T) {
+	ln, err := net.Listen("tcp", "127.0.0.1:0")
+	if err != nil {
+		t.Fatal(err)
+	}
+	addr := ln.Addr().String()
+	go func() {
+		for {
+			c, err := ln.Accept()
+			if err != nil {
+				return
+			}
+			c.Close()
+		}
+	}()
+	if f := proxyFinding(context.Background(), addr); f != nil {
+		t.Fatalf("listening proxy reported: %+v", f)
+	}
+	ln.Close()
+	f := proxyFinding(context.Background(), addr)
+	if f == nil || f.Key != "proxy" || !strings.Contains(f.SummaryEN, addr) {
+		t.Fatalf("closed proxy = %+v, want the proxy finding", f)
+	}
+}
+
+func TestSplitList(t *testing.T) {
+	got := splitList(" /, /var/lib/felis ,,")
+	if strings.Join(got, "|") != "/|/var/lib/felis" {
+		t.Fatalf("splitList = %q", got)
+	}
+}