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cmd/derpprobe,prober: add ability to perform continuous queuing delay measurements against DERP servers

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This new type of probe sends DERP packets sized similarly to CallMeMaybe packets
at a rate of 10 packets per second. It records the round-trip times in a Prometheus
histogram. It also keeps track of how many packets are dropped. Packets that fail to
arrive within 5 seconds are considered dropped.

Updates tailscale/corp#24522

Signed-off-by: Percy Wegmann <percy@tailscale.com>
This commit is contained in:
Percy Wegmann
2024-12-16 23:05:46 -06:00
committed by Percy Wegmann
parent 6ae0287a57
commit 00a4504cf1
8 changed files with 429 additions and 55 deletions
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59
prober/status.html
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@@ -73,8 +73,9 @@
<th>Name</th>
<th>Probe Class & Labels</th>
<th>Interval</th>
<th>Last Attempt</th>
<th>Success</th>
<th>Last Finished</th>
<th>Last Started</th>
<th>Status</th>
<th>Latency</th>
<th>Last Error</th>
</tr></thead>
@@ -85,9 +86,11 @@
{{$name}}
{{range $text, $url := $probeInfo.Links}}
<br/>
<button onclick="location.href='{{$url}}';" type="button">
{{$text}}
</button>
{{if not $probeInfo.Continuous}}
<button onclick="location.href='{{$url}}';" type="button">
{{$text}}
</button>
{{end}}
{{end}}
</td>
<td>{{$probeInfo.Class}}<br/>
@@ -97,28 +100,48 @@
{{end}}
</div>
</td>
<td>{{$probeInfo.Interval}}</td>
<td data-sort="{{$probeInfo.TimeSinceLast.Milliseconds}}">
{{if $probeInfo.TimeSinceLast}}
{{$probeInfo.TimeSinceLast.String}} ago<br/>
<td>
{{if $probeInfo.Continuous}}
Continuous
{{else}}
{{$probeInfo.Interval}}
{{end}}
</td>
<td data-sort="{{$probeInfo.TimeSinceLastEnd.Milliseconds}}">
{{if $probeInfo.TimeSinceLastEnd}}
{{$probeInfo.TimeSinceLastEnd.String}} ago<br/>
<span class="small">{{$probeInfo.End.Format "2006-01-02T15:04:05Z07:00"}}</span>
{{else}}
Never
{{end}}
</td>
<td>
{{if $probeInfo.Result}}
{{$probeInfo.Result}}
<td data-sort="{{$probeInfo.TimeSinceLastStart.Milliseconds}}">
{{if $probeInfo.TimeSinceLastStart}}
{{$probeInfo.TimeSinceLastStart.String}} ago<br/>
<span class="small">{{$probeInfo.Start.Format "2006-01-02T15:04:05Z07:00"}}</span>
{{else}}
<span class="error">{{$probeInfo.Result}}</span>
Never
{{end}}
</td>
<td>
{{if $probeInfo.Error}}
<span class="error">{{$probeInfo.Status}}</span>
{{else}}
{{$probeInfo.Status}}
{{end}}<br/>
<div class="small">Recent: {{$probeInfo.RecentResults}}</div>
<div class="small">Mean: {{$probeInfo.RecentSuccessRatio}}</div>
{{if not $probeInfo.Continuous}}
<div class="small">Recent: {{$probeInfo.RecentResults}}</div>
<div class="small">Mean: {{$probeInfo.RecentSuccessRatio}}</div>
{{end}}
</td>
<td data-sort="{{$probeInfo.Latency.Milliseconds}}">
{{$probeInfo.Latency.String}}
<div class="small">Recent: {{$probeInfo.RecentLatencies}}</div>
<div class="small">Median: {{$probeInfo.RecentMedianLatency}}</div>
{{if $probeInfo.Continuous}}
n/a
{{else}}
{{$probeInfo.Latency.String}}
<div class="small">Recent: {{$probeInfo.RecentLatencies}}</div>
<div class="small">Median: {{$probeInfo.RecentMedianLatency}}</div>
{{end}}
</td>
<td class="small">{{$probeInfo.Error}}</td>
</tr>