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Root cause analysis / Investigation

chatgpt.com

Reference RCA-8ACF2C656F952C93

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

28 Oct 2026 23:25 – 29 Oct 2026 03:14 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
1.189 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
1.270 ms
1.435 ms
1.369 ms
1.415 ms
1.195 ms
1.213 ms
1.422 ms
1.546 ms
1.458 ms
1.410 ms
18.628 ms
1.190 ms
1.185 ms
1.414 ms
1.218 ms
1.424 ms
1.209 ms
1.411 ms
1.444 ms
1.485 ms
1.243 ms
1.148 ms
1.225 ms
1.609 ms
1.202 ms
1.511 ms
1.431 ms
1.215 ms
1.418 ms
1.379 ms
1.190 ms
1.200 ms
1.228 ms
1.164 ms
6.355 ms
1.367 ms
1.394 ms
1.186 ms
1.533 ms
1.421 ms
1.412 ms
1.387 ms
18.813 ms
1.212 ms
15.211 ms
1.423 ms
1.420 ms
1.444 ms
1.408 ms
1.186 ms
1.213 ms
1.165 ms
1.212 ms
1.412 ms
1.438 ms
7.716 ms
1.459 ms
1.247 ms
1.294 ms
1.204 ms
1.476 ms
19.962 ms
1.189 ms
1.208 ms
11.253 ms
1.199 ms
1.205 ms
1.287 ms
1.420 ms
1.163 ms
1.200 ms
1.396 ms
1.349 ms
1.199 ms
1.219 ms
1.408 ms
14.931 ms
1.445 ms
1.233 ms
1.217 ms
1.417 ms
1.421 ms
1.379 ms
1.409 ms
1.198 ms
1.243 ms
1.171 ms
1.335 ms
1.228 ms
2.680 ms
1.174 ms
10.888 ms
4.953 ms
1.156 ms
1.400 ms
1.468 ms
1.227 ms
1.186 ms
1.409 ms
1.216 ms
1.423 ms
1.244 ms
1.427 ms
1.404 ms
1.430 ms
1.416 ms
1.225 ms
1.419 ms
1.217 ms
1.409 ms
1.479 ms
1.263 ms
1.183 ms
1.429 ms
1.176 ms
1.215 ms
1.179 ms
1.490 ms
1.209 ms
1.205 ms
1.429 ms
1.169 ms
1.397 ms
8.724 ms
1.189 ms
1.270 ms
1.312 ms
1.216 ms
1.209 ms
1.217 ms
1.179 ms
1.196 ms
1.846 ms
1.223 ms
1.210 ms
1.213 ms
1.228 ms
1.194 ms
1.215 ms
1.335 ms
1.195 ms
1.388 ms
1.482 ms
1.403 ms
1.194 ms
1.398 ms
1.659 ms
1.596 ms
11.036 ms
1.361 ms
1.407 ms
1.221 ms
4.725 ms
1.367 ms
1.199 ms
1.217 ms
1.492 ms
1.423 ms
9.409 ms
1.250 ms
1.287 ms
1.169 ms
1.407 ms
1.190 ms
1.391 ms
1.196 ms
1.428 ms
1.407 ms
1.197 ms
1.207 ms
1.175 ms
1.489 ms
1.434 ms
1.518 ms
1.249 ms
1.407 ms
1.356 ms
1.245 ms
1.213 ms
1.371 ms
1.172 ms
1.418 ms
1.169 ms
1.169 ms
1.140 ms
1.388 ms
1.564 ms
1.526 ms
1.416 ms
1.163 ms
9.762 ms
1.196 ms
6.245 ms
1.380 ms
1.275 ms
1.572 ms
1.354 ms
1.397 ms
2.812 ms
1.207 ms
1.373 ms
1.627 ms
12.385 ms
12.838 ms
1.245 ms
1.233 ms
1.181 ms
1.399 ms
1.419 ms
1.435 ms
1.182 ms
1.413 ms
16.644 ms
1.201 ms
1.176 ms
1.408 ms
1.198 ms
1.470 ms
1.193 ms
1.406 ms
1.205 ms
1.166 ms
1.367 ms
1.408 ms
1.432 ms
1.410 ms
1.409 ms
1.369 ms
1.393 ms
3.910 ms
1.389 ms
1.157 ms
1.405 ms
1.374 ms
1.437 ms
1.206 ms
1.385 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 replied


to UTC

  1. TTL 1 Probe hop0.124 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.177 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop16.988 msReply RTT AS13335 · Cloudflare
  4. TTL 4 Probe hop2.603 msReply RTT AS13335 · Cloudflare
  5. TTL 5 Probe hop3.685 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination1.423 msReply RTT AS13335 · Cloudflare
Before

TCP traceroute / 443 · Recorded address 1

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.161 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.188 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop0.790 msReply RTT AS13335 · Cloudflare
  4. TTL 4 Probe hopNo replyNo comparable RTT ASN unavailable
  5. TTL 5 Probe hop2.071 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination1.456 msReply RTT AS13335 · Cloudflare
Before

ICMP traceroute · Recorded address 1

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.132 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.186 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop77.073 msReply RTT AS13335 · Cloudflare
Before

TCP traceroute / 443 · Recorded address 1

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.161 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.240 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop8.800 msReply RTT AS13335 · Cloudflare
  4. TTL 4 Probe hopNo replyNo comparable RTT ASN unavailable
  5. TTL 5 Probe hop6.792 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Probe hopNo replyNo comparable RTT ASN unavailable
  7. TTL 7 Destination2.156 msReply RTT AS13335 · Cloudflare
Before

TCP traceroute / 443 · Recorded address 2

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.248 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.206 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 hop11.357 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination1.390 msReply RTT AS13335 · Cloudflare
During

ICMP traceroute · Recorded address 1

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.124 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.177 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop1.551 msReply RTT ASN unavailable
During

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 hop0.180 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop1.122 msReply RTT ASN unavailable
  4. TTL 4 Probe hopNo replyNo comparable RTT ASN unavailable
  5. TTL 5 Probe hop23.685 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination1.399 msReply RTT AS13335 · Cloudflare
During

ICMP traceroute · Recorded address 1

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.131 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.184 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop0.741 msReply RTT AS13335 · Cloudflare
  4. TTL 4 Probe hop7.417 msReply RTT AS13335 · Cloudflare
  5. TTL 5 Probe hop1.482 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination1.278 msReply RTT AS13335 · Cloudflare
During

TCP traceroute / 443 · Recorded address 2

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.152 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.219 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop1.466 msReply RTT AS13335 · Cloudflare
  4. TTL 4 Probe hopNo replyNo comparable RTT ASN unavailable
  5. TTL 5 Probe hop1.730 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination1.422 msReply RTT AS13335 · Cloudflare
During

ICMP traceroute · Recorded address 2

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.132 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.180 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop2.120 msReply RTT AS13335 · Cloudflare
During

TCP traceroute / 443 · Recorded address 1

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.149 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.178 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop7.888 msReply RTT AS13335 · Cloudflare
  4. TTL 4 Probe hopNo replyNo comparable RTT ASN unavailable
  5. TTL 5 Probe hop1.852 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination1.380 msReply RTT AS13335 · Cloudflare
After

ICMP traceroute · Recorded address 1

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.245 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.237 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop0.858 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 hop0.195 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop1.712 msReply RTT AS13335 · Cloudflare
  4. TTL 4 Probe hop1.654 msReply RTT AS13335 · Cloudflare
  5. TTL 5 Probe hop1.342 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination1.273 msReply RTT AS13335 · Cloudflare
After

ICMP traceroute · Recorded address 1

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.127 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.176 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop1.501 msReply RTT AS13335 · Cloudflare
  4. TTL 4 Probe hop1.470 msReply RTT AS13335 · Cloudflare
  5. TTL 5 Probe hop1.823 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination1.230 msReply RTT AS13335 · Cloudflare
After

TCP traceroute / 443 · Recorded address 2

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 hop0.962 msReply RTT AS13335 · Cloudflare
  4. TTL 4 Probe hopNo replyNo comparable RTT ASN unavailable
  5. TTL 5 Probe hop2.394 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Probe hopNo replyNo comparable RTT ASN unavailable
  7. TTL 7 Destination2.095 msReply RTT AS13335 · Cloudflare
After

ICMP traceroute · Recorded address 2

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.195 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.197 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop19.596 msReply RTT AS13335 · Cloudflare
After

TCP traceroute / 443 · Recorded address 2

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.146 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.212 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop0.881 msReply RTT AS13335 · Cloudflare
  4. TTL 4 Probe hopNo replyNo comparable RTT ASN unavailable
  5. TTL 5 Probe hop1.691 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination1.204 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
10.132 msAS8002 · Stealth0.124 msAS8002 · StealthSame responder
20.186 msAS8002 · Stealth0.177 msAS8002 · StealthSame responder
377.073 msAS13335 · Cloudflare1.551 msSame responder
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
10.124 msAS8002 · Stealth0.132 msAS8002 · StealthSame responder
20.177 msAS8002 · Stealth0.180 msAS8002 · StealthSame responder
316.988 msAS13335 · Cloudflare2.120 msAS13335 · CloudflareSame responder
42.603 msAS13335 · CloudflareNot recordedNot established
53.685 msAS13335 · CloudflareNot recordedNot established
61.423 msAS13335 · CloudflareNot recordedNot 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
10.161 msAS8002 · Stealth0.199 msAS8002 · StealthSame responder
20.240 msAS8002 · Stealth0.180 msAS8002 · StealthSame responder
38.800 msAS13335 · Cloudflare1.122 msSame responder
4No replyNo replyNot established
56.792 msAS13335 · Cloudflare23.685 msAS13335 · CloudflareDifferent responders
6No reply1.399 msAS13335 · CloudflareNot established
72.156 msAS13335 · CloudflareNot recordedNot established
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
10.248 msAS8002 · Stealth0.152 msAS8002 · StealthSame responder
20.206 msAS8002 · Stealth0.219 msAS8002 · StealthSame responder
3No reply1.466 msAS13335 · CloudflareNot established
4No replyNo replyNot established
511.357 msAS13335 · Cloudflare1.730 msAS13335 · CloudflareSame responder
61.390 msAS13335 · Cloudflare1.422 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 RTT1.374 msUsual round trip before the event
Last recorded event RTT1.490 msLast successful event recording
Event p95 RTT10.906 ms95th percentile of successful recordings
Change from baseline+0.116 msLast event RTT compared with the baseline
Successful / expected recordings220 / 220Recorded 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