diff --git a/agent/probe.go b/agent/probe.go
index 6ebfc57d..f6165444 100644
--- a/agent/probe.go
+++ b/agent/probe.go
@@ -8,8 +8,9 @@ import (
 	"sync"
 	"time"
 
-	"github.com/henrygd/beszel/internal/entities/probe"
 	"log/slog"
+
+	"github.com/henrygd/beszel/internal/entities/probe"
 )
 
 // ProbeManager manages network probe tasks.
@@ -33,7 +34,7 @@ type probeSample struct {
 
 func newProbeManager() *ProbeManager {
 	return &ProbeManager{
-		probes: make(map[string]*probeTask),
+		probes:     make(map[string]*probeTask),
 		httpClient: &http.Client{Timeout: 10 * time.Second},
 	}
 }
@@ -145,8 +146,7 @@ func (pm *ProbeManager) runProbe(task *probeTask) {
 	if interval < time.Second {
 		interval = 10 * time.Second
 	}
-	ticker := time.NewTicker(interval)
-	defer ticker.Stop()
+	ticker := time.Tick(interval)
 
 	// Run immediately on start
 	pm.executeProbe(task)
@@ -155,7 +155,7 @@ func (pm *ProbeManager) runProbe(task *probeTask) {
 		select {
 		case <-task.cancel:
 			return
-		case <-ticker.C:
+		case <-ticker:
 			pm.executeProbe(task)
 		}
 	}
@@ -185,8 +185,8 @@ func (pm *ProbeManager) executeProbe(task *probeTask) {
 	// Trim old samples beyond 120s to bound memory
 	cutoff := time.Now().Add(-120 * time.Second)
 	start := 0
-	for i, s := range task.samples {
-		if s.timestamp.After(cutoff) {
+	for i := range task.samples {
+		if task.samples[i].timestamp.After(cutoff) {
 			start = i
 			break
 		}
@@ -195,7 +195,8 @@ func (pm *ProbeManager) executeProbe(task *probeTask) {
 		}
 	}
 	if start > 0 {
-		task.samples = task.samples[start:]
+		size := copy(task.samples, task.samples[start:])
+		task.samples = task.samples[:size]
 	}
 	task.samples = append(task.samples, sample)
 	task.mu.Unlock()
diff --git a/agent/probe_ping.go b/agent/probe_ping.go
index ad73a4bc..06a620b8 100644
--- a/agent/probe_ping.go
+++ b/agent/probe_ping.go
@@ -24,10 +24,10 @@ var pingTimeRegex = regexp.MustCompile(`time[=<]([\d.]+)\s*ms`)
 type icmpMethod int
 
 const (
-	icmpUntried    icmpMethod = iota // haven't tried yet
-	icmpRaw                          // privileged raw socket (ip4:icmp)
-	icmpDatagram                     // unprivileged datagram socket (udp4)
-	icmpExecFallback                 // shell out to system ping command
+	icmpUntried      icmpMethod = iota // haven't tried yet
+	icmpRaw                            // privileged raw socket (ip4:icmp)
+	icmpDatagram                       // unprivileged datagram socket (udp4)
+	icmpExecFallback                   // shell out to system ping command
 )
 
 var (
diff --git a/internal/site/src/components/routes/system/probe-dialog.tsx b/internal/site/src/components/routes/system/probe-dialog.tsx
index 8c8915ee..c944875b 100644
--- a/internal/site/src/components/routes/system/probe-dialog.tsx
+++ b/internal/site/src/components/routes/system/probe-dialog.tsx
@@ -17,13 +17,7 @@ import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from "@
 import { PlusIcon } from "lucide-react"
 import { useToast } from "@/components/ui/use-toast"
 
-export function AddProbeDialog({
-	systemId,
-	onCreated,
-}: {
-	systemId: string
-	onCreated: () => void
-}) {
+export function AddProbeDialog({ systemId, onCreated }: { systemId: string; onCreated: () => void }) {
 	const [open, setOpen] = useState(false)
 	const [protocol, setProtocol] = useState<string>("icmp")
 	const [target, setTarget] = useState("")
@@ -60,8 +54,8 @@ export function AddProbeDialog({
 			resetForm()
 			setOpen(false)
 			onCreated()
-		} catch (err: any) {
-			toast({ variant: "destructive", title: t`Error`, description: err?.message })
+		} catch (err: unknown) {
+			toast({ variant: "destructive", title: t`Error`, description: (err as Error)?.message })
 		} finally {
 			setLoading(false)
 		}
@@ -85,6 +79,17 @@ export function AddProbeDialog({
 					</DialogDescription>
 				</DialogHeader>
 				<form onSubmit={handleSubmit} className="grid gap-4">
+					<div className="grid gap-2">
+						<Label>
+							<Trans>Target</Trans>
+						</Label>
+						<Input
+							value={target}
+							onChange={(e) => setTarget(e.target.value)}
+							placeholder={protocol === "http" ? "https://example.com" : "1.1.1.1"}
+							required
+						/>
+					</div>
 					<div className="grid gap-2">
 						<Label>
 							<Trans>Protocol</Trans>
@@ -100,17 +105,6 @@ export function AddProbeDialog({
 							</SelectContent>
 						</Select>
 					</div>
-					<div className="grid gap-2">
-						<Label>
-							<Trans>Target</Trans>
-						</Label>
-						<Input
-							value={target}
-							onChange={(e) => setTarget(e.target.value)}
-							placeholder={protocol === "http" ? "https://example.com" : "1.1.1.1"}
-							required
-						/>
-					</div>
 					{protocol === "tcp" && (
 						<div className="grid gap-2">
 							<Label>
@@ -147,7 +141,7 @@ export function AddProbeDialog({
 						<Input
 							value={name}
 							onChange={(e) => setName(e.target.value)}
-							placeholder={t`e.g. Cloudflare DNS`}
+							placeholder={target || t`e.g. Cloudflare DNS`}
 						/>
 					</div>
 					<DialogFooter>