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Root cause analysis / Investigation

chatgpt.com

Reference RCA-D0456AEE723E28F4

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

28 Oct 2026 22:15 – 29 Oct 2026 01:04 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
1.225 ms
1.358 ms
1.161 ms
1.154 ms
1.380 ms
8.217 ms
1.213 ms
4.769 ms
1.511 ms
15.978 ms
1.237 ms
1.394 ms
1.384 ms
1.386 ms
1.400 ms
1.421 ms
1.385 ms
1.224 ms
1.374 ms
1.475 ms
1.250 ms
1.414 ms
1.171 ms
1.187 ms
1.175 ms
1.239 ms
1.485 ms
1.225 ms
1.188 ms
1.238 ms
1.480 ms
1.171 ms
1.166 ms
1.239 ms
1.198 ms
1.462 ms
1.391 ms
1.373 ms
1.355 ms
1.458 ms
1.167 ms
1.316 ms
1.464 ms
1.177 ms
1.398 ms
1.260 ms
1.266 ms
1.444 ms
5.447 ms
1.172 ms
1.245 ms
1.253 ms
1.395 ms
1.628 ms
1.405 ms
1.235 ms
1.413 ms
1.419 ms
1.405 ms
1.430 ms
1.166 ms
1.466 ms
1.184 ms
1.193 ms
1.191 ms
1.391 ms
1.214 ms
1.420 ms
1.495 ms
1.409 ms
1.429 ms
1.222 ms
1.396 ms
1.337 ms
1.403 ms
1.374 ms
1.159 ms
1.410 ms
1.232 ms
1.465 ms
1.196 ms
1.201 ms
1.219 ms
1.406 ms
1.221 ms
1.443 ms
1.422 ms
1.183 ms
1.180 ms
1.222 ms
1.196 ms
1.427 ms
1.192 ms
1.433 ms
1.163 ms
1.200 ms
1.190 ms
1.239 ms
1.179 ms
1.234 ms
1.263 ms
1.181 ms
1.189 ms
2.444 ms
1.181 ms
1.198 ms
2.774 ms
1.428 ms
1.548 ms
1.417 ms
1.440 ms
1.387 ms
1.537 ms
1.498 ms
1.680 ms
1.523 ms
2.719 ms
1.444 ms
1.396 ms
1.250 ms
1.235 ms
5.967 ms
1.192 ms
16.428 ms
1.191 ms
1.415 ms
1.200 ms
8.531 ms
1.550 ms
1.207 ms
1.411 ms
3.793 ms
8.498 ms
1.424 ms
15.390 ms
1.218 ms
1.235 ms
1.197 ms
14.726 ms
1.166 ms
1.189 ms
1.200 ms
1.513 ms
1.385 ms
17.932 ms
1.415 ms
1.416 ms
1.448 ms
1.192 ms
1.183 ms
1.439 ms
1.401 ms
16.190 ms
1.208 ms
1.458 ms
1.398 ms
1.176 ms
1.450 ms
1.354 ms
1.400 ms
15.677 ms
8.666 ms
1.216 ms
1.166 ms
1.233 ms
1.185 ms
1.242 ms
1.368 ms
1.404 ms
2.809 ms
4.045 ms
1.256 ms
1.211 ms
1.399 ms
1.236 ms
1.412 ms
1.164 ms
1.384 ms
1.439 ms
1.193 ms
1.220 ms
1.406 ms
1.202 ms
1.210 ms
7.068 ms
1.164 ms
1.258 ms
1.212 ms
1.260 ms
1.251 ms
1.261 ms
1.228 ms
1.428 ms
1.189 ms
1.442 ms
1.198 ms
1.437 ms
1.424 ms
3.360 ms
1.166 ms
1.417 ms
1.408 ms
1.909 ms
1.191 ms
1.399 ms
1.198 ms
1.367 ms
1.303 ms
1.469 ms
1.233 ms
1.624 ms
1.318 ms
1.423 ms
1.177 ms
1.175 ms
1.441 ms
1.467 ms
1.236 ms
1.210 ms
1.404 ms
1.400 ms
1.252 ms
1.214 ms
1.177 ms
1.396 ms
1.289 ms
1.215 ms
1.197 ms
1.357 ms
1.417 ms
1.444 ms
1.364 ms
1.422 ms
1.211 ms
1.465 ms
1.378 ms
1.503 ms
1.165 ms
1.381 ms
1.450 ms
1.205 ms
1.378 ms
1.213 ms
1.454 ms
1.214 ms
1.187 ms
1.415 ms
1.223 ms
1.254 ms
1.540 ms
1.430 ms
1.386 ms
1.244 ms
1.400 ms
1.386 ms
1.437 ms
1.202 ms
1.424 ms
1.429 ms
1.252 ms
16.885 ms
1.261 ms
1.239 ms
1.270 ms
1.203 ms
1.435 ms
1.415 ms
1.369 ms
1.243 ms
1.415 ms
1.444 ms
1.195 ms
1.213 ms
6.110 ms
1.422 ms
18.834 ms
1.546 ms
1.196 ms
1.458 ms
1.273 ms
1.410 ms
1.195 ms
18.628 ms
1.190 ms
1.391 ms
1.185 ms
1.187 ms
1.414 ms
1.251 ms
1.218 ms
1.205 ms
1.424 ms
1.387 ms
1.209 ms
1.411 ms
10.149 ms
1.444 ms
5.114 ms
1.485 ms
1.415 ms
1.243 ms
1.576 ms
1.148 ms
1.238 ms
1.225 ms
1.200 ms
1.609 ms
1.202 ms
1.198 ms
1.511 ms
1.403 ms
1.431 ms
1.179 ms
1.215 ms
1.400 ms
1.418 ms
1.409 ms
1.379 ms
1.190 ms
1.426 ms
1.200 ms
1.204 ms
1.228 ms
1.401 ms
1.164 ms
1.142 ms
6.355 ms
1.218 ms
1.367 ms
1.394 ms
1.384 ms
1.186 ms
1.250 ms
1.533 ms
1.261 ms
1.421 ms
1.456 ms
1.412 ms
1.263 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 1

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.137 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.179 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop1.419 msReply RTT AS13335 · Cloudflare
Before

TCP traceroute / 443 · Recorded address 1

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.167 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.182 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop1.403 msReply RTT AS13335 · Cloudflare
  4. TTL 4 Probe hop1.809 msReply RTT AS13335 · Cloudflare
  5. TTL 5 Probe hop1.499 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination1.440 msReply RTT AS13335 · Cloudflare
Before

ICMP traceroute · Recorded address 1

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.148 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.220 msReply RTT AS8002 · Stealth
Before

TCP traceroute / 443 · Recorded address 1

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.181 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.181 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop0.962 msReply RTT AS13335 · Cloudflare
  4. TTL 4 Probe hopNo replyNo comparable RTT ASN unavailable
  5. TTL 5 Probe hop6.795 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination0.995 msReply RTT AS13335 · Cloudflare
Before

TCP traceroute / 443 · Recorded address 1

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.147 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 hop1.843 msReply RTT AS13335 · Cloudflare
  5. TTL 5 Probe hop1.911 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Probe hopNo replyNo comparable RTT ASN unavailable
  7. TTL 7 Destination1.597 msReply RTT AS13335 · Cloudflare
During

ICMP traceroute · Recorded address 1

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.134 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.183 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop35.519 msReply RTT ASN unavailable
During

TCP traceroute / 443 · Recorded address 2

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.272 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.191 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop33.965 msReply RTT ASN unavailable
  4. TTL 4 Probe hop4.281 msReply RTT AS13335 · Cloudflare
  5. TTL 5 Probe hop7.269 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Probe hopNo replyNo comparable RTT ASN unavailable
  7. TTL 7 Destination2.037 msReply RTT AS13335 · Cloudflare
During

ICMP traceroute · Recorded address 2

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.143 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.184 msReply RTT AS8002 · Stealth
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 hop0.265 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop10.928 msReply RTT AS13335 · Cloudflare
  4. TTL 4 Probe hopNo replyNo comparable RTT ASN unavailable
  5. TTL 5 Probe hop1.583 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination1.686 msReply RTT AS13335 · Cloudflare
During

ICMP traceroute · Recorded address 1

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.139 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.176 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop30.582 msReply RTT AS13335 · Cloudflare
During

TCP traceroute / 443 · Recorded address 2

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.257 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.192 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 hop2.032 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination1.516 msReply RTT AS13335 · Cloudflare
After

ICMP traceroute · Recorded address 2

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.136 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.191 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop1.506 msReply RTT AS13335 · Cloudflare
After

TCP traceroute / 443 · Recorded address 2

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.153 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.184 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop1.198 msReply RTT AS13335 · Cloudflare
  4. TTL 4 Probe hopNo replyNo comparable RTT ASN unavailable
  5. TTL 5 Probe hop1.632 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination1.354 msReply RTT AS13335 · Cloudflare
After

ICMP traceroute · Recorded address 2

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.133 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.176 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop1.560 msReply RTT AS13335 · Cloudflare
After

TCP traceroute / 443 · Recorded address 2

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.160 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.191 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop7.684 msReply RTT AS13335 · Cloudflare
  4. TTL 4 Probe hopNo replyNo comparable RTT ASN unavailable
  5. TTL 5 Probe hop4.905 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination0.915 msReply RTT AS13335 · Cloudflare
After

ICMP traceroute · Recorded address 1

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.132 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.499 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop0.946 msReply RTT AS13335 · Cloudflare
After

TCP traceroute / 443 · Recorded address 2

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.188 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.177 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop5.886 msReply RTT AS13335 · Cloudflare
  4. TTL 4 Probe hopNo replyNo comparable RTT ASN unavailable
  5. TTL 5 Probe hop3.275 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination1.087 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
10.148 msAS8002 · Stealth0.134 msAS8002 · StealthSame responder
20.220 msAS8002 · Stealth0.183 msAS8002 · StealthSame responder
3Not recorded35.519 msNot 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
10.147 msAS8002 · Stealth0.148 msAS8002 · StealthSame responder
20.189 msAS8002 · Stealth0.265 msAS8002 · StealthSame responder
3No reply10.928 msAS13335 · CloudflareNot established
41.843 msAS13335 · CloudflareNo replyNot established
51.911 msAS13335 · Cloudflare1.583 msAS13335 · CloudflareDifferent responders
6No reply1.686 msAS13335 · CloudflareNot established
71.597 msAS13335 · CloudflareNot recordedNot established

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 RTT1.375 msUsual round trip before the event
Last recorded event RTT1.404 msLast successful event recording
Event p95 RTT14.759 ms95th percentile of successful recordings
Change from baseline+0.029 msLast event RTT compared with the baseline
Successful / expected recordings100 / 100Recorded 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