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Root cause analysis / Investigation

chatgpt.com

Reference RCA-657FBD54AE46C631

OpenAI Chat website

Measurement point: Stealth NYC, 32 Avenue of the Americas.

Published investigation. Updates run automatically.

01 / Network path

Network path.

Endpoint measurements / ICMP IPv4

Latency over time.

Successful endpoint RTT recordings from up to one hour before and after the event. Points are sampled from the retained history.

Enter time range

Times use the selected timezone; choices include recorded samples and intervals across the available chart.

Use the recordings table below to view latency values.
Successful RTT recording Event interval

27 Oct 2026 23:25 – 28 Oct 2026 03:59 UTC. Hover or tap to inspect; drag across the chart to zoom. On touchscreens, first choose Select time range. Escape or Reset zoom restores the full range. Missing recordings are gaps; this is not an application availability or packet-loss chart.

Select a recording to explore nearby path observations.

View recorded values
Successful ICMP IPv4 RTT recordings; displayed points are a sample of the retained records.
Recorded at (UTC)RTT
1.139 ms
6.292 ms
2.424 ms
1.157 ms
1.385 ms
1.153 ms
4.246 ms
1.234 ms
1.387 ms
1.396 ms
1.408 ms
20.004 ms
1.168 ms
1.327 ms
2.567 ms
1.415 ms
6.669 ms
1.441 ms
1.188 ms
1.160 ms
4.477 ms
1.414 ms
1.168 ms
1.173 ms
1.395 ms
1.422 ms
2.853 ms
1.177 ms
8.045 ms
1.349 ms
1.379 ms
1.522 ms
7.699 ms
1.249 ms
1.525 ms
1.422 ms
1.166 ms
7.817 ms
7.138 ms
1.192 ms
1.398 ms
1.233 ms
4.554 ms
1.564 ms
1.438 ms
1.359 ms
1.429 ms
1.199 ms
1.366 ms
1.215 ms
1.378 ms
1.163 ms
1.175 ms
1.267 ms
1.425 ms
1.380 ms
1.276 ms
1.405 ms
1.465 ms
1.157 ms
1.390 ms
1.173 ms
1.631 ms
1.181 ms
2.890 ms
1.348 ms
1.453 ms
1.417 ms
1.183 ms
1.380 ms
1.473 ms
1.150 ms
1.355 ms
1.197 ms
1.401 ms
1.199 ms
1.469 ms
1.381 ms
1.405 ms
1.177 ms
1.483 ms
1.358 ms
1.370 ms
1.367 ms
1.184 ms
1.531 ms
1.419 ms
1.395 ms
1.200 ms
1.482 ms
2.398 ms
1.410 ms
1.382 ms
1.192 ms
1.451 ms
1.403 ms
7.477 ms
3.824 ms
15.785 ms
7.672 ms
1.172 ms
1.129 ms
1.403 ms
1.290 ms
6.685 ms
1.180 ms
1.418 ms
1.540 ms
1.371 ms
1.158 ms
1.198 ms
1.220 ms
1.137 ms
1.373 ms
1.213 ms
1.148 ms
1.428 ms
1.677 ms
1.373 ms
1.376 ms
1.417 ms
1.409 ms
1.399 ms
1.394 ms
1.281 ms
1.393 ms
14.264 ms
1.212 ms
1.475 ms
19.099 ms
1.180 ms
1.404 ms
1.390 ms
1.381 ms
1.432 ms
1.158 ms
1.180 ms
2.962 ms
1.585 ms
1.373 ms
1.417 ms
1.319 ms
1.164 ms
1.182 ms
1.401 ms
1.394 ms
2.287 ms
1.304 ms
1.169 ms
1.475 ms
1.219 ms
11.915 ms
1.369 ms
19.764 ms
1.411 ms
5.398 ms
11.284 ms
1.415 ms
1.240 ms
1.145 ms
5.656 ms
18.750 ms
1.260 ms
1.428 ms
1.518 ms
3.488 ms
1.303 ms
1.348 ms
1.132 ms
1.428 ms
1.204 ms
5.611 ms
1.229 ms
1.163 ms
1.490 ms
1.397 ms
1.184 ms
1.168 ms
1.410 ms
1.224 ms
1.147 ms
18.444 ms
2.523 ms
1.367 ms
1.374 ms
4.833 ms
1.552 ms
12.992 ms
1.364 ms
1.533 ms
1.408 ms
1.421 ms
1.425 ms
4.011 ms
1.150 ms
18.452 ms
1.393 ms
1.270 ms
1.405 ms
1.255 ms
1.450 ms
1.351 ms
1.388 ms
1.434 ms
2.544 ms
18.101 ms
1.461 ms
1.412 ms
1.164 ms
1.425 ms
1.142 ms
3.493 ms
1.178 ms
1.176 ms
1.217 ms
1.206 ms
1.198 ms
1.160 ms
1.162 ms
1.157 ms
1.207 ms
1.379 ms
1.156 ms
1.413 ms
1.172 ms
3.056 ms
1.382 ms
1.178 ms
1.345 ms
1.185 ms
1.392 ms
1.430 ms
1.328 ms
1.400 ms
1.408 ms
1.238 ms
1.403 ms
1.365 ms
1.127 ms
1.199 ms
1.612 ms
1.405 ms
1.402 ms
1.155 ms
1.342 ms
1.461 ms
1.361 ms
1.416 ms
1.487 ms
1.384 ms
1.383 ms
1.225 ms
1.396 ms
1.145 ms
1.376 ms
1.178 ms
1.485 ms
1.174 ms
1.194 ms
1.223 ms
3.609 ms
1.137 ms
1.188 ms
1.240 ms
1.186 ms
1.162 ms
1.153 ms
1.373 ms
1.148 ms
1.172 ms
1.172 ms
1.179 ms
1.407 ms
1.388 ms
1.388 ms
1.183 ms
1.166 ms
1.266 ms
1.151 ms
1.409 ms
1.347 ms
1.367 ms
1.261 ms
1.411 ms
1.418 ms
1.146 ms
1.433 ms
1.163 ms
1.221 ms
1.435 ms
1.176 ms
1.380 ms
1.164 ms
1.204 ms
1.157 ms
1.158 ms
1.145 ms
1.410 ms
1.155 ms
1.233 ms
1.351 ms
1.397 ms
1.183 ms
1.474 ms
1.403 ms
1.175 ms
17.840 ms
1.390 ms
6.371 ms
1.560 ms
1.457 ms
1.402 ms
3.585 ms
1.447 ms
1.362 ms
1.414 ms
1.398 ms
1.177 ms
1.375 ms
1.163 ms
1.214 ms
6.015 ms
1.506 ms
1.439 ms
1.162 ms
1.420 ms
1.250 ms
1.404 ms
1.145 ms
2.358 ms
1.332 ms
1.147 ms
1.352 ms
1.180 ms
1.418 ms
1.404 ms
6.437 ms
1.391 ms
1.417 ms
1.133 ms
1.356 ms
1.172 ms
1.172 ms
1.177 ms
1.209 ms
1.376 ms
2.732 ms
2.019 ms
1.386 ms
1.360 ms
1.143 ms
1.153 ms
1.356 ms
1.394 ms
1.433 ms
1.160 ms
1.424 ms
1.373 ms
1.175 ms
Network path / recorded observations

Network path observations.

17 observations

Choose a measurement type to see the closest of the available sampled observations to the selected chart point. Each probe is separate and may follow a different path.

Before

ICMP traceroute · Recorded address 2

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.128 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.195 msReply RTT AS8002 · Stealth
Before

TCP traceroute / 443 · Recorded address 1

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.209 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.189 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop2.138 msReply RTT AS13335 · Cloudflare
  4. TTL 4 Probe hopNo replyNo comparable RTT ASN unavailable
  5. TTL 5 Probe hop8.559 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination4.247 msReply RTT AS13335 · Cloudflare
Before

ICMP traceroute · Recorded address 2

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.130 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.176 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop1.012 msReply RTT AS13335 · Cloudflare
Before

TCP traceroute / 443 · Recorded address 1

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.199 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.281 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hopNo replyNo comparable RTT ASN unavailable
  4. TTL 4 Probe hopNo replyNo comparable RTT ASN unavailable
  5. TTL 5 Probe hop4.527 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination1.370 msReply RTT AS13335 · Cloudflare
Before

TCP traceroute / 443 · Recorded address 2

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.369 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.184 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop7.476 msReply RTT ASN unavailable
  4. TTL 4 Probe hopNo replyNo comparable RTT ASN unavailable
  5. TTL 5 Probe hop1.405 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Probe hopNo replyNo comparable RTT ASN unavailable
  7. TTL 7 Destination2.005 msReply RTT AS13335 · Cloudflare
During

ICMP traceroute · Recorded address 2

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.125 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.179 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop22.963 msReply RTT AS13335 · Cloudflare
  4. TTL 4 Probe hop1.710 msReply RTT AS13335 · Cloudflare
  5. TTL 5 Probe hop1.872 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination1.414 msReply RTT AS13335 · Cloudflare
During

TCP traceroute / 443 · Recorded address 1

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.190 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.180 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop1.488 msReply RTT AS13335 · Cloudflare
  4. TTL 4 Probe hopNo replyNo comparable RTT ASN unavailable
  5. TTL 5 Probe hop1.372 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination1.373 msReply RTT AS13335 · Cloudflare
During

ICMP traceroute · Recorded address 1

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.141 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.176 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop10.446 msReply RTT AS13335 · Cloudflare
During

TCP traceroute / 443 · Recorded address 1

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.239 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.250 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop1.655 msReply RTT AS13335 · Cloudflare
  4. TTL 4 Probe hopNo replyNo comparable RTT ASN unavailable
  5. TTL 5 Probe hop8.487 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Probe hopNo replyNo comparable RTT ASN unavailable
  7. TTL 7 Destination1.589 msReply RTT AS13335 · Cloudflare
During

ICMP traceroute · Recorded address 2

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.248 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.217 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop10.135 msReply RTT AS13335 · Cloudflare
During

TCP traceroute / 443 · Recorded address 1

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.148 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.186 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop1.523 msReply RTT AS13335 · Cloudflare
  4. TTL 4 Probe hopNo replyNo comparable RTT ASN unavailable
  5. TTL 5 Probe hop4.857 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination2.203 msReply RTT AS13335 · Cloudflare
After

ICMP traceroute · Recorded address 2

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.123 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.229 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop0.714 msReply RTT AS13335 · Cloudflare
After

TCP traceroute / 443 · Recorded address 1

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.235 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.192 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop1.526 msReply RTT AS13335 · Cloudflare
  4. TTL 4 Probe hopNo replyNo comparable RTT ASN unavailable
  5. TTL 5 Probe hop3.283 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination1.271 msReply RTT AS13335 · Cloudflare
After

ICMP traceroute · Recorded address 2

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.128 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.178 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop1.028 msReply RTT AS13335 · Cloudflare
  4. TTL 4 Probe hop1.456 msReply RTT AS13335 · Cloudflare
  5. TTL 5 Probe hop2.247 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination1.375 msReply RTT AS13335 · Cloudflare
After

TCP traceroute / 443 · Recorded address 1

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.143 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.184 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop20.936 msReply RTT AS13335 · Cloudflare
  4. TTL 4 Probe hop1.846 msReply RTT AS13335 · Cloudflare
  5. TTL 5 Probe hop2.299 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination1.500 msReply RTT AS13335 · Cloudflare
After

ICMP traceroute · Recorded address 1

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.133 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.201 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop1.621 msReply RTT AS13335 · Cloudflare
After

TCP traceroute / 443 · Recorded address 2

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.151 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.215 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop1.271 msReply RTT AS13335 · Cloudflare
  4. TTL 4 Probe hopNo replyNo comparable RTT ASN unavailable
  5. TTL 5 Probe hop1.376 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination0.916 msReply RTT AS13335 · Cloudflare

RTT is the round trip to each responding hop, not the delay of the preceding link. TTL order may omit routers and does not prove direct links. A missing reply is not proof of packet loss. ASN labels are dated address associations; they do not establish the forwarding path or the operator at the event time. Up to three recorded traces per method and period are selected across the archive. Where no individual trace is available, a comparison may summarize a window; MTR observations aggregate multiple probes. Address aliases are independent across measurement types.

Same method / same recorded address

Compare the traces.

Compare one selected trace from before the event with one during it. Values are individual replies, not a statistical comparison.

ICMP traceroute · Recorded address 2

Before: UTC · During: UTC

Same destination address and probe method. A matching TTL does not establish the same forwarding path.
TTLBefore RTTDuring RTTResponding address
10.130 msAS8002 · Stealth0.125 msAS8002 · StealthSame responder
20.176 msAS8002 · Stealth0.179 msAS8002 · StealthSame responder
31.012 msAS13335 · Cloudflare22.963 msAS13335 · CloudflareSame responder
4Not recorded1.710 msAS13335 · CloudflareNot established
5Not recorded1.872 msAS13335 · CloudflareNot established
6Not recorded1.414 msAS13335 · CloudflareNot established
TCP traceroute / 443 · Recorded address 1

Before: UTC · During: UTC

Same destination address and probe method. A matching TTL does not establish the same forwarding path.
TTLBefore RTTDuring RTTResponding address
10.199 msAS8002 · Stealth0.190 msAS8002 · StealthSame responder
20.281 msAS8002 · Stealth0.180 msAS8002 · StealthSame responder
3No reply1.488 msAS13335 · CloudflareNot established
4No replyNo replyNot established
54.527 msAS13335 · Cloudflare1.372 msAS13335 · CloudflareDifferent responders
61.370 msAS13335 · Cloudflare1.373 msAS13335 · CloudflareSame responder

RTTs include the return path. Different responders, missing replies and independent probe flows limit what a change can localize. MTR snapshots remain separate in the replay.

Event timeline.

Possible SLA event. Times shown are UTC.

Event opened
UTC
Last event observation
UTC
Recovery observed
UTC

Recorded recovery describes this event, not current reachability.

02 / Assessment

Assessment.

Investigation stateRecovered
Path assessment

Elevated latency observed.

Endpoint round-trip time was elevated during part of the event. The available path observations do not identify where the increase occurred.

What we observed

  • A sustained increase in measured round trip time was observed.
  • Stored traces were compared using matching source and destination addresses.

Recording counts describe collected measurements, not application availability or packet loss. Exact packet paths and the return path remain unverified.

Measurements at a glance.

Baseline RTT1.372 msUsual round trip before the event
Last recorded event RTT1.199 msLast successful event recording
Event p95 RTT16.552 ms95th percentile of successful recordings
Change from baseline-0.173 msLast event RTT compared with the baseline
Successful / expected recordings310 / 310Recorded endpoint samples during the event

RTT is round trip time; p95 describes the upper range of successful recordings. Endpoint measurements differ from individual trace replies and are not an uptime percentage.

Record sources and timestamps
Analysis updated
UTC
Public snapshot published
UTC
Public observation window
– UTC

Event and source timestamps are UTC. The latency chart uses its selected timezone. Page refresh times are separate from measurement timestamps.

03 / Method and limits

Method and limits.

How to interpret the sampled path and its limits

Corroborating the path.

Comparisons use matching destinations before and during the event. ICMP traces use echo probes. TCP/443 traces send SYN probes to port 443 only; they do not complete a TCP handshake or perform a TLS or HTTP exchange.

The Stealth gNMI interface verifies the active route-table choice and maps its primary next hop to the Stealth logical interface, configured attachment and, where applicable, the known LAG member set at each snapshot. Stable Stealth replies, together with mapped interface evidence showing no corresponding errors or sustained capacity pressure, reduce the likelihood of a Stealth forwarding issue. An 80% load warning warrants investigation; it does not prove congestion. Lower interval averages can conceal bursts or queue pressure. Optical readings assess the physical link, not congestion.

What remains unseen.

Probe reply handling can differ from packet forwarding. A slow intermediate reply that disappears at later hops does not locate a forwarding problem. A destination that does not respond to a trace is not thereby shown to be unavailable.

Stealth does not use ECMP in this monitored scope. The route snapshot does not identify which physical LAG member carried a particular independent probe, attest line-card forwarding at that packet instant, prove the exact application packet flow or observe the return path. RTT includes the return path, which may differ. No remote reverse traceroute is available. Tunnels and silent routers may hide parts of the path. Address registration alone does not establish the forwarding operator or responsibility.

References: ICMP reply handling / RFC 1812 · Round trip measurements / RFC 2681 · Full methodology