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Root cause analysis / Investigation

chatgpt.com

Reference RCA-798EEFA4FE6F7225

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

02 Nov 2026 13:25 – 02 Nov 2026 22:24 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
1.388 ms
1.377 ms
1.342 ms
1.343 ms
1.278 ms
1.153 ms
1.358 ms
1.431 ms
1.570 ms
1.440 ms
1.614 ms
1.340 ms
1.371 ms
1.239 ms
1.150 ms
1.357 ms
1.384 ms
1.396 ms
1.376 ms
1.344 ms
1.193 ms
1.184 ms
1.360 ms
1.148 ms
1.340 ms
1.395 ms
1.144 ms
1.117 ms
1.321 ms
1.132 ms
1.168 ms
1.181 ms
1.385 ms
1.370 ms
1.420 ms
1.431 ms
1.430 ms
1.199 ms
1.168 ms
1.230 ms
1.627 ms
1.167 ms
1.374 ms
1.151 ms
1.403 ms
1.422 ms
1.431 ms
1.426 ms
1.275 ms
1.363 ms
1.427 ms
1.409 ms
1.358 ms
1.351 ms
1.184 ms
1.341 ms
1.136 ms
1.189 ms
13.764 ms
1.437 ms
1.694 ms
1.196 ms
1.138 ms
1.114 ms
1.177 ms
1.130 ms
1.139 ms
1.126 ms
1.128 ms
1.344 ms
1.583 ms
1.373 ms
1.413 ms
1.405 ms
1.348 ms
1.181 ms
1.373 ms
1.382 ms
7.851 ms
1.157 ms
1.367 ms
1.379 ms
1.134 ms
1.133 ms
1.122 ms
1.366 ms
1.147 ms
1.128 ms
1.442 ms
1.415 ms
1.383 ms
1.156 ms
1.433 ms
1.180 ms
1.767 ms
1.166 ms
1.179 ms
1.357 ms
1.414 ms
1.137 ms
1.181 ms
1.204 ms
10.585 ms
14.490 ms
1.191 ms
1.372 ms
1.363 ms
1.366 ms
1.221 ms
1.149 ms
1.323 ms
1.406 ms
1.149 ms
1.430 ms
1.161 ms
1.140 ms
1.157 ms
1.513 ms
1.385 ms
1.347 ms
1.349 ms
1.348 ms
1.374 ms
1.404 ms
1.131 ms
1.149 ms
1.168 ms
18.984 ms
1.159 ms
1.416 ms
13.623 ms
6.125 ms
4.573 ms
1.171 ms
2.948 ms
1.177 ms
3.736 ms
14.371 ms
18.524 ms
2.359 ms
1.611 ms
13.923 ms
17.364 ms
1.802 ms
17.408 ms
1.139 ms
1.232 ms
18.225 ms
1.216 ms
16.964 ms
8.973 ms
14.260 ms
1.189 ms
2.100 ms
9.757 ms
19.610 ms
8.501 ms
5.970 ms
5.438 ms
9.542 ms
9.243 ms
5.444 ms
9.895 ms
1.425 ms
9.646 ms
19.542 ms
15.402 ms
15.179 ms
1.140 ms
12.668 ms
16.654 ms
6.978 ms
1.238 ms
18.399 ms
1.413 ms
1.157 ms
7.817 ms
1.637 ms
9.752 ms
19.713 ms
1.352 ms
18.042 ms
2.046 ms
1.209 ms
1.404 ms
8.411 ms
14.684 ms
19.359 ms
1.426 ms
6.434 ms
14.551 ms
1.177 ms
21.163 ms
1.433 ms
16.443 ms
19.052 ms
17.918 ms
1.173 ms
19.844 ms
1.366 ms
15.591 ms
7.833 ms
17.479 ms
16.213 ms
1.195 ms
1.159 ms
1.168 ms
2.363 ms
15.642 ms
13.579 ms
17.294 ms
1.197 ms
1.129 ms
1.520 ms
5.542 ms
10.173 ms
1.366 ms
1.458 ms
1.270 ms
1.159 ms
1.487 ms
2.761 ms
3.216 ms
1.357 ms
1.468 ms
1.146 ms
1.157 ms
4.232 ms
4.980 ms
1.164 ms
1.193 ms
1.145 ms
1.404 ms
1.198 ms
1.401 ms
1.154 ms
1.139 ms
1.127 ms
1.146 ms
1.204 ms
1.462 ms
1.176 ms
1.360 ms
1.142 ms
1.127 ms
1.144 ms
1.368 ms
1.594 ms
1.352 ms
1.143 ms
1.414 ms
1.182 ms
1.193 ms
1.220 ms
1.379 ms
1.456 ms
10.033 ms
1.387 ms
8.691 ms
18.184 ms
1.342 ms
1.841 ms
19.118 ms
1.385 ms
1.267 ms
1.139 ms
1.164 ms
1.116 ms
18.055 ms
1.169 ms
1.132 ms
1.399 ms
1.125 ms
1.141 ms
1.410 ms
1.168 ms
1.361 ms
1.347 ms
1.183 ms
1.111 ms
1.331 ms
1.485 ms
1.439 ms
1.172 ms
1.442 ms
1.382 ms
1.373 ms
1.193 ms
1.176 ms
1.159 ms
1.135 ms
1.354 ms
1.137 ms
1.188 ms
18.191 ms
1.374 ms
1.258 ms
1.475 ms
2.071 ms
1.342 ms
1.385 ms
1.150 ms
1.364 ms
1.365 ms
11.694 ms
1.140 ms
1.133 ms
1.397 ms
1.370 ms
1.180 ms
1.206 ms
1.150 ms
1.343 ms
1.191 ms
1.199 ms
1.426 ms
1.157 ms
1.333 ms
1.360 ms
1.349 ms
1.374 ms
1.690 ms
1.302 ms
1.416 ms
1.195 ms
1.409 ms
1.130 ms
1.425 ms
1.131 ms
1.368 ms
7.435 ms
1.357 ms
1.130 ms
1.156 ms
1.373 ms
1.130 ms
1.424 ms
1.152 ms
1.158 ms
1.161 ms
1.354 ms
1.378 ms
1.360 ms
7.148 ms
1.354 ms
1.385 ms
1.363 ms
1.367 ms
1.368 ms
1.133 ms
1.155 ms
1.135 ms
1.341 ms
1.136 ms
4.967 ms
1.154 ms
1.173 ms
1.150 ms
1.201 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 hop0.132 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.180 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop7.037 msReply RTT AS13335 · Cloudflare
Before

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 hop0.240 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop1.779 msReply RTT AS13335 · Cloudflare
  4. TTL 4 Probe hopNo replyNo comparable RTT ASN unavailable
  5. TTL 5 Probe hop4.552 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Probe hopNo replyNo comparable RTT ASN unavailable
  7. TTL 7 Destination1.548 msReply RTT AS13335 · Cloudflare
Before

ICMP traceroute · Recorded address 1

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.128 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.187 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop0.693 msReply RTT AS13335 · Cloudflare
Before

TCP traceroute / 443 · Recorded address 1

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.163 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.180 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop1.729 msReply RTT AS13335 · Cloudflare
  4. TTL 4 Probe hopNo replyNo comparable RTT ASN unavailable
  5. TTL 5 Probe hop2.088 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination1.524 msReply RTT AS13335 · Cloudflare
Before

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 hop0.179 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop0.652 msReply RTT ASN unavailable
  4. TTL 4 Probe hop13.583 msReply RTT AS13335 · Cloudflare
  5. TTL 5 Probe hop4.012 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination1.337 msReply RTT AS13335 · Cloudflare
During

ICMP traceroute · Recorded address 2

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.122 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.181 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop2.213 msReply RTT ASN unavailable
During

TCP traceroute / 443 · Recorded address 1

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.171 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.815 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 hop2.254 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination1.253 msReply RTT AS13335 · Cloudflare
During

ICMP traceroute · Recorded address 1

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.129 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.178 msReply RTT AS8002 · Stealth
During

TCP traceroute / 443 · Recorded address 1

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.186 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.179 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 hop1.940 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination1.691 msReply RTT AS13335 · Cloudflare
During

ICMP traceroute · Recorded address 2

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.121 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.181 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop1.835 msReply RTT AS13335 · Cloudflare
During

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 hop0.272 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop6.076 msReply RTT AS13335 · Cloudflare
  4. TTL 4 Probe hopNo replyNo comparable RTT ASN unavailable
  5. TTL 5 Probe hop2.264 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Probe hopNo replyNo comparable RTT ASN unavailable
  7. TTL 7 Destination1.569 msReply RTT AS13335 · Cloudflare
After

ICMP traceroute · Recorded address 2

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.132 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.186 msReply RTT AS8002 · Stealth
After

TCP traceroute / 443 · Recorded address 1

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.208 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.612 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 hop7.569 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination1.496 msReply RTT AS13335 · Cloudflare
After

ICMP traceroute · Recorded address 2

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.368 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.202 msReply RTT AS8002 · Stealth
After

TCP traceroute / 443 · Recorded address 2

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.150 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.189 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 hop1.286 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination1.387 msReply RTT AS13335 · Cloudflare
After

ICMP traceroute · Recorded address 1

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.122 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.200 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop10.117 msReply RTT AS13335 · Cloudflare
  4. TTL 4 Probe hop1.897 msReply RTT AS13335 · Cloudflare
  5. TTL 5 Probe hop2.142 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination1.525 msReply RTT AS13335 · Cloudflare
After

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 hop0.184 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop1.053 msReply RTT AS13335 · Cloudflare
  4. TTL 4 Probe hopNo replyNo comparable RTT ASN unavailable
  5. TTL 5 Probe hop1.373 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Probe hopNo replyNo comparable RTT ASN unavailable
  7. TTL 7 Destination1.949 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
10.128 msAS8002 · Stealth0.129 msAS8002 · StealthSame responder
20.187 msAS8002 · Stealth0.178 msAS8002 · StealthSame responder
30.693 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
10.132 msAS8002 · Stealth0.122 msAS8002 · StealthSame responder
20.180 msAS8002 · Stealth0.181 msAS8002 · StealthSame responder
37.037 msAS13335 · Cloudflare2.213 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
10.143 msAS8002 · Stealth0.171 msAS8002 · StealthSame responder
20.179 msAS8002 · Stealth0.815 msAS8002 · StealthSame responder
30.652 msNo replyNot established
413.583 msAS13335 · CloudflareNo replyNot established
54.012 msAS13335 · Cloudflare2.254 msAS13335 · CloudflareDifferent responders
61.337 msAS13335 · Cloudflare1.253 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 RTT1.324 msUsual round trip before the event
Last recorded event RTT1.204 msLast successful event recording
Event p95 RTT19.268 ms95th percentile of successful recordings
Change from baseline-0.120 msLast event RTT compared with the baseline
Successful / expected recordings826 / 840Recorded 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