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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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17
prober/prober_test.go
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@@ -316,7 +316,7 @@ func TestProberProbeInfo(t *testing.T) {
Interval: probeInterval,
Labels: map[string]string{"class": "", "name": "probe1"},
Latency: 500 * time.Millisecond,
Result: true,
Status: ProbeStatusSucceeded,
RecentResults: []bool{true},
RecentLatencies: []time.Duration{500 * time.Millisecond},
},
@@ -324,6 +324,7 @@ func TestProberProbeInfo(t *testing.T) {
Name: "probe2",
Interval: probeInterval,
Labels: map[string]string{"class": "", "name": "probe2"},
Status: ProbeStatusFailed,
Error: "error2",
RecentResults: []bool{false},
RecentLatencies: nil, // no latency for failed probes
@@ -349,7 +350,7 @@ func TestProbeInfoRecent(t *testing.T) {
}{
{
name: "no_runs",
wantProbeInfo: ProbeInfo{},
wantProbeInfo: ProbeInfo{Status: ProbeStatusUnknown},
wantRecentSuccessRatio: 0,
wantRecentMedianLatency: 0,
},
@@ -358,7 +359,7 @@ func TestProbeInfoRecent(t *testing.T) {
results: []probeResult{{latency: 100 * time.Millisecond, err: nil}},
wantProbeInfo: ProbeInfo{
Latency: 100 * time.Millisecond,
Result: true,
Status: ProbeStatusSucceeded,
RecentResults: []bool{true},
RecentLatencies: []time.Duration{100 * time.Millisecond},
},
@@ -369,7 +370,7 @@ func TestProbeInfoRecent(t *testing.T) {
name: "single_failure",
results: []probeResult{{latency: 100 * time.Millisecond, err: errors.New("error123")}},
wantProbeInfo: ProbeInfo{
Result: false,
Status: ProbeStatusFailed,
RecentResults: []bool{false},
RecentLatencies: nil,
Error: "error123",
@@ -390,7 +391,7 @@ func TestProbeInfoRecent(t *testing.T) {
{latency: 80 * time.Millisecond, err: nil},
},
wantProbeInfo: ProbeInfo{
Result: true,
Status: ProbeStatusSucceeded,
Latency: 80 * time.Millisecond,
RecentResults: []bool{false, true, true, false, true, true, false, true},
RecentLatencies: []time.Duration{
@@ -420,7 +421,7 @@ func TestProbeInfoRecent(t *testing.T) {
{latency: 110 * time.Millisecond, err: nil},
},
wantProbeInfo: ProbeInfo{
Result: true,
Status: ProbeStatusSucceeded,
Latency: 110 * time.Millisecond,
RecentResults: []bool{true, true, true, true, true, true, true, true, true, true},
RecentLatencies: []time.Duration{
@@ -483,7 +484,7 @@ func TestProberRunHandler(t *testing.T) {
ProbeInfo: ProbeInfo{
Name: "success",
Interval: probeInterval,
Result: true,
Status: ProbeStatusSucceeded,
RecentResults: []bool{true, true},
},
PreviousSuccessRatio: 1,
@@ -498,7 +499,7 @@ func TestProberRunHandler(t *testing.T) {
ProbeInfo: ProbeInfo{
Name: "failure",
Interval: probeInterval,
Result: false,
Status: ProbeStatusFailed,
Error: "error123",
RecentResults: []bool{false, false},
},