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Root cause analysis / Investigation

chatgpt.com

Reference RCA-E62D5CC0041A679B

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.

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

05 Nov 2026 22:40 – 06 Nov 2026 01:39 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.
Recorded at (UTC)RTT
1.411 ms
1.153 ms
1.407 ms
1.387 ms
1.163 ms
1.451 ms
1.157 ms
1.378 ms
1.122 ms
1.428 ms
1.433 ms
12.147 ms
1.422 ms
1.345 ms
1.497 ms
1.389 ms
1.353 ms
1.398 ms
1.137 ms
1.137 ms
1.185 ms
1.399 ms
1.150 ms
1.135 ms
1.167 ms
1.218 ms
1.421 ms
1.368 ms
1.171 ms
1.422 ms
1.115 ms
1.393 ms
1.146 ms
1.172 ms
1.398 ms
1.370 ms
1.168 ms
1.186 ms
1.365 ms
1.327 ms
1.362 ms
1.332 ms
1.247 ms
1.360 ms
1.379 ms
1.342 ms
1.156 ms
1.161 ms
1.417 ms
3.385 ms
1.371 ms
1.310 ms
1.715 ms
1.365 ms
1.138 ms
1.343 ms
1.165 ms
1.139 ms
1.365 ms
1.141 ms
1.375 ms
1.357 ms
1.402 ms
7.654 ms
1.409 ms
1.372 ms
1.306 ms
1.151 ms
1.141 ms
1.395 ms
1.331 ms
1.339 ms
1.146 ms
1.383 ms
1.450 ms
1.366 ms
1.151 ms
19.933 ms
1.358 ms
1.162 ms
1.349 ms
1.374 ms
1.137 ms
1.378 ms
1.414 ms
1.285 ms
1.429 ms
1.133 ms
1.139 ms
1.328 ms
1.365 ms
1.182 ms
1.139 ms
1.171 ms
1.147 ms
1.161 ms
1.574 ms
1.148 ms
1.365 ms
1.162 ms
1.146 ms
1.170 ms
1.362 ms
1.191 ms
1.132 ms
10.152 ms
1.131 ms
1.489 ms
1.459 ms
1.154 ms
1.438 ms
1.348 ms
1.394 ms
1.155 ms
1.416 ms
1.139 ms
1.143 ms
1.170 ms
1.329 ms
1.332 ms
1.137 ms
1.136 ms
1.346 ms
10.976 ms
1.137 ms
1.149 ms
1.480 ms
1.151 ms
1.368 ms
1.230 ms
1.369 ms
1.383 ms
1.361 ms
1.366 ms
1.187 ms
1.418 ms
1.424 ms
8.590 ms
1.155 ms
1.408 ms
1.158 ms
1.150 ms
1.406 ms
1.130 ms
7.236 ms
1.223 ms
1.400 ms
1.168 ms
1.308 ms
1.155 ms
1.370 ms
1.157 ms
1.145 ms
1.169 ms
1.147 ms
1.383 ms
1.183 ms
1.163 ms
1.249 ms
1.151 ms
1.372 ms
1.367 ms
1.166 ms
1.346 ms
1.360 ms
1.283 ms
1.206 ms
1.152 ms
1.485 ms
1.489 ms
15.982 ms
1.358 ms
1.147 ms
19.918 ms
1.157 ms
1.442 ms
1.206 ms
1.344 ms
1.166 ms
15.152 ms
1.147 ms
3.629 ms
2.290 ms
1.176 ms
1.419 ms
1.359 ms
1.667 ms
10.569 ms
1.176 ms
1.388 ms
1.429 ms
1.160 ms
1.370 ms
7.838 ms
1.335 ms
1.197 ms
1.186 ms
1.230 ms
1.361 ms
1.372 ms
1.132 ms
1.188 ms
1.382 ms
1.162 ms
1.293 ms
1.426 ms
1.338 ms
1.201 ms
5.271 ms
1.168 ms
1.148 ms
1.164 ms
1.428 ms
1.377 ms
1.566 ms
1.399 ms
1.145 ms
1.397 ms
1.153 ms
1.403 ms
1.157 ms
1.543 ms
1.157 ms
1.136 ms
1.383 ms
1.409 ms
1.588 ms
1.368 ms
1.335 ms
3.022 ms
1.328 ms
1.142 ms
1.369 ms
1.399 ms
1.340 ms
1.148 ms
1.206 ms
1.143 ms
1.347 ms
1.152 ms
1.125 ms
1.385 ms
1.388 ms
1.160 ms
1.181 ms
1.188 ms
1.154 ms
1.575 ms
1.181 ms
1.186 ms
1.186 ms
4.624 ms
1.384 ms
1.425 ms
1.440 ms
1.357 ms
1.169 ms
1.161 ms
1.190 ms
1.450 ms
1.182 ms
1.367 ms
1.132 ms
1.484 ms
1.164 ms
1.168 ms
1.185 ms
1.342 ms
1.414 ms
1.368 ms
1.397 ms
1.484 ms
1.165 ms
1.139 ms
1.149 ms
1.165 ms
1.335 ms
1.358 ms
1.319 ms
1.218 ms
1.160 ms
1.175 ms
1.181 ms
1.365 ms
1.897 ms
1.139 ms
1.148 ms
1.381 ms
1.422 ms
1.158 ms
1.168 ms
11.465 ms
1.147 ms
1.202 ms
1.137 ms
1.339 ms
1.318 ms
1.190 ms
1.285 ms
1.392 ms
1.499 ms
1.200 ms
2.854 ms
1.147 ms
1.393 ms
1.169 ms
1.327 ms
3.796 ms
1.382 ms
1.156 ms
1.156 ms
1.135 ms
1.419 ms
1.400 ms
1.698 ms
1.383 ms
1.424 ms
1.188 ms
1.301 ms
1.362 ms
1.369 ms
1.258 ms
1.331 ms
18.798 ms
1.372 ms
1.173 ms
1.368 ms
1.328 ms
1.359 ms
1.203 ms
1.357 ms
1.375 ms
1.462 ms
1.269 ms
1.162 ms
1.388 ms
1.139 ms
1.140 ms
1.350 ms
1.210 ms
1.165 ms
1.112 ms
1.146 ms
1.393 ms
1.388 ms
5.541 ms
1.367 ms
1.352 ms
1.376 ms
1.401 ms
1.600 ms
3.409 ms
1.365 ms
1.215 ms
1.371 ms
1.358 ms
1.159 ms
1.340 ms
Network path / recorded observations

Network path observations.

18 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 replied


to UTC

  1. TTL 1 Probe hop0.112 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.178 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop1.690 msReply RTT AS13335 · Cloudflare
  4. TTL 4 Probe hop12.951 msReply RTT AS13335 · Cloudflare
  5. TTL 5 Probe hop59.899 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination1.450 msReply RTT AS13335 · Cloudflare
Before

TCP traceroute / 443 · Recorded address 1

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.150 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.274 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop1.868 msReply RTT AS13335 · Cloudflare
  4. TTL 4 Probe hopNo replyNo comparable RTT ASN unavailable
  5. TTL 5 Probe hop1.884 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination1.356 msReply RTT AS13335 · Cloudflare
Before

ICMP traceroute · Recorded address 2

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.131 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.182 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop1.111 msReply RTT ASN unavailable
Before

TCP traceroute / 443 · Recorded address 1

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.176 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.177 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop0.694 msReply RTT ASN unavailable
  4. TTL 4 Probe hopNo replyNo comparable RTT ASN unavailable
  5. TTL 5 Probe hop6.754 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination1.419 msReply RTT AS13335 · Cloudflare
Before

ICMP traceroute · Recorded address 1

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.124 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.187 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop34.090 msReply RTT ASN unavailable
  4. TTL 4 Probe hop5.049 msReply RTT AS13335 · Cloudflare
  5. TTL 5 Probe hop2.943 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination1.239 msReply RTT AS13335 · Cloudflare
Before

TCP traceroute / 443 · Recorded address 2

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.157 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.178 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop1.479 msReply RTT ASN unavailable
  4. TTL 4 Probe hopNo replyNo comparable RTT ASN unavailable
  5. TTL 5 Probe hop2.058 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination1.172 msReply RTT AS13335 · Cloudflare
During

ICMP traceroute · Recorded address 2

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.119 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.184 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop0.659 msReply RTT ASN unavailable
During

TCP traceroute / 443 · Recorded address 1

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.141 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.188 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop1.521 msReply RTT ASN unavailable
  4. TTL 4 Probe hopNo replyNo comparable RTT ASN unavailable
  5. TTL 5 Probe hop2.105 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination1.454 msReply RTT AS13335 · Cloudflare
During

ICMP traceroute · Recorded address 1

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.206 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.240 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop1.206 msReply RTT AS13335 · Cloudflare
During

TCP traceroute / 443 · Recorded address 2

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.228 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.186 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop1.935 msReply RTT AS13335 · Cloudflare
  4. TTL 4 Probe hopNo replyNo comparable RTT ASN unavailable
  5. TTL 5 Probe hop4.532 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination1.406 msReply RTT AS13335 · Cloudflare
During

ICMP traceroute · Recorded address 2

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.130 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.218 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop27.351 msReply RTT AS13335 · Cloudflare
During

TCP traceroute / 443 · Recorded address 1

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.188 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.196 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop1.640 msReply RTT AS13335 · Cloudflare
  4. TTL 4 Probe hopNo replyNo comparable RTT ASN unavailable
  5. TTL 5 Probe hop2.090 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Probe hopNo replyNo comparable RTT ASN unavailable
  7. TTL 7 Destination1.581 msReply RTT AS13335 · Cloudflare
After

ICMP traceroute · Recorded address 1

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.131 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.188 msReply RTT AS8002 · Stealth
After

TCP traceroute / 443 · Recorded address 2

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.137 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.506 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 hop2.236 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination1.921 msReply RTT AS13335 · Cloudflare
After

ICMP traceroute · Recorded address 2

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.138 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.196 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop9.609 msReply RTT ASN unavailable
After

TCP traceroute / 443 · Recorded address 1

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.139 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.170 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop1.765 msReply RTT ASN unavailable
  4. TTL 4 Probe hopNo replyNo comparable RTT ASN unavailable
  5. TTL 5 Probe hop1.926 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Probe hopNo replyNo comparable RTT ASN unavailable
  7. TTL 7 Destination1.822 msReply RTT AS13335 · Cloudflare
After

ICMP traceroute · Recorded address 2

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.127 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.185 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop1.136 msReply RTT ASN unavailable
After

TCP traceroute / 443 · Recorded address 2

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.220 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.251 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop13.129 msReply RTT ASN unavailable
  4. TTL 4 Probe hop1.856 msReply RTT AS13335 · Cloudflare
  5. TTL 5 Probe hop1.500 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination1.411 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 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
10.124 msAS8002 · Stealth0.206 msAS8002 · StealthSame responder
20.187 msAS8002 · Stealth0.240 msAS8002 · StealthSame responder
334.090 ms1.206 msAS13335 · CloudflareSame responder
45.049 msAS13335 · CloudflareNot recordedNot established
52.943 msAS13335 · CloudflareNot recordedNot established
61.239 msAS13335 · CloudflareNot recordedNot established
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
10.131 msAS8002 · Stealth0.119 msAS8002 · StealthSame responder
20.182 msAS8002 · Stealth0.184 msAS8002 · StealthSame responder
31.111 ms0.659 msSame responder
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
10.176 msAS8002 · Stealth0.141 msAS8002 · StealthSame responder
20.177 msAS8002 · Stealth0.188 msAS8002 · StealthSame responder
30.694 ms1.521 msSame responder
4No replyNo replyNot established
56.754 msAS13335 · Cloudflare2.105 msAS13335 · CloudflareDifferent responders
61.419 msAS13335 · Cloudflare1.454 msAS13335 · CloudflareSame responder
TCP traceroute / 443 · 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
10.157 msAS8002 · Stealth0.228 msAS8002 · StealthSame responder
20.178 msAS8002 · Stealth0.186 msAS8002 · StealthSame responder
31.479 ms1.935 msAS13335 · CloudflareSame responder
4No replyNo replyNot established
52.058 msAS13335 · Cloudflare4.532 msAS13335 · CloudflareDifferent responders
61.172 msAS13335 · Cloudflare1.406 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.

Latency anomaly. 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 RTT1.369 msUsual round trip before the event
Last recorded event RTT1.152 msLast successful event recording
Event p95 RTT7.875 ms95th percentile of successful recordings
Change from baseline-0.217 msLast event RTT compared with the baseline
Successful / expected recordings120 / 120Recorded 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