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Root cause analysis / Investigation

api.openai.com

Reference RCA-386E71A17870EB63

OpenAI API endpoint

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

03 Nov 2026 16:20 – 03 Nov 2026 21:24 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
1.377 ms
1.503 ms
1.410 ms
1.377 ms
1.440 ms
1.357 ms
1.362 ms
19.903 ms
18.070 ms
1.330 ms
1.347 ms
15.920 ms
17.520 ms
20.085 ms
10.103 ms
1.413 ms
14.963 ms
7.379 ms
17.761 ms
1.330 ms
1.331 ms
20.374 ms
19.947 ms
17.217 ms
1.357 ms
1.321 ms
13.445 ms
2.846 ms
1.375 ms
1.725 ms
1.593 ms
1.418 ms
1.372 ms
1.441 ms
1.379 ms
1.346 ms
1.420 ms
1.414 ms
1.341 ms
3.879 ms
1.527 ms
1.479 ms
1.444 ms
1.326 ms
1.386 ms
1.604 ms
1.370 ms
1.492 ms
1.324 ms
1.515 ms
6.457 ms
1.355 ms
1.413 ms
1.330 ms
1.464 ms
1.469 ms
1.382 ms
1.353 ms
1.347 ms
1.352 ms
1.371 ms
1.385 ms
7.689 ms
1.347 ms
1.337 ms
1.335 ms
1.344 ms
3.055 ms
1.467 ms
1.457 ms
1.411 ms
1.347 ms
1.387 ms
1.358 ms
1.345 ms
1.406 ms
19.343 ms
1.389 ms
2.057 ms
1.394 ms
1.414 ms
12.102 ms
19.081 ms
1.408 ms
1.366 ms
17.606 ms
1.299 ms
1.322 ms
1.406 ms
1.360 ms
1.727 ms
1.439 ms
1.386 ms
1.403 ms
1.354 ms
1.445 ms
1.406 ms
1.418 ms
1.347 ms
1.388 ms
1.355 ms
1.504 ms
1.443 ms
1.384 ms
1.376 ms
1.356 ms
1.316 ms
1.364 ms
1.350 ms
1.365 ms
1.334 ms
1.444 ms
1.397 ms
1.348 ms
1.387 ms
1.350 ms
1.335 ms
1.331 ms
1.398 ms
1.603 ms
1.357 ms
1.470 ms
1.452 ms
1.356 ms
2.484 ms
1.348 ms
1.350 ms
1.371 ms
1.600 ms
1.441 ms
1.362 ms
6.797 ms
1.482 ms
19.508 ms
1.355 ms
1.996 ms
1.387 ms
13.688 ms
1.317 ms
1.382 ms
1.381 ms
12.375 ms
1.411 ms
1.355 ms
1.374 ms
1.333 ms
2.984 ms
7.755 ms
1.429 ms
11.968 ms
1.467 ms
1.392 ms
1.448 ms
1.432 ms
1.356 ms
1.339 ms
1.753 ms
1.576 ms
1.383 ms
1.968 ms
1.368 ms
1.336 ms
1.503 ms
1.487 ms
1.338 ms
18.586 ms
1.413 ms
1.338 ms
1.509 ms
1.395 ms
1.343 ms
1.344 ms
1.356 ms
8.594 ms
2.849 ms
1.479 ms
1.339 ms
1.465 ms
1.384 ms
1.336 ms
1.418 ms
1.502 ms
1.360 ms
1.346 ms
2.637 ms
1.370 ms
1.367 ms
19.098 ms
1.338 ms
1.361 ms
1.475 ms
1.572 ms
1.385 ms
1.533 ms
8.693 ms
9.592 ms
1.319 ms
1.396 ms
1.441 ms
1.335 ms
1.432 ms
1.299 ms
7.086 ms
11.558 ms
1.358 ms
5.380 ms
8.445 ms
1.332 ms
1.382 ms
16.649 ms
1.336 ms
1.357 ms
7.554 ms
1.379 ms
1.639 ms
1.479 ms
1.365 ms
1.378 ms
6.998 ms
1.343 ms
1.321 ms
1.435 ms
19.667 ms
1.347 ms
1.392 ms
1.335 ms
1.450 ms
1.353 ms
1.403 ms
1.379 ms
1.338 ms
1.400 ms
1.374 ms
1.321 ms
1.343 ms
1.436 ms
1.391 ms
1.444 ms
1.333 ms
1.351 ms
3.848 ms
1.361 ms
1.520 ms
1.359 ms
1.483 ms
1.422 ms
1.359 ms
1.351 ms
1.366 ms
1.411 ms
1.457 ms
1.404 ms
1.357 ms
1.380 ms
1.422 ms
18.072 ms
4.073 ms
1.364 ms
1.402 ms
1.458 ms
1.320 ms
1.367 ms
1.350 ms
4.865 ms
1.437 ms
4.080 ms
17.268 ms
1.496 ms
1.372 ms
1.927 ms
4.723 ms
1.355 ms
1.371 ms
1.383 ms
1.352 ms
9.484 ms
1.488 ms
1.328 ms
1.321 ms
1.431 ms
20.034 ms
1.401 ms
1.390 ms
1.368 ms
1.336 ms
4.406 ms
1.595 ms
2.149 ms
1.409 ms
1.400 ms
1.395 ms
19.275 ms
1.425 ms
1.341 ms
1.362 ms
1.503 ms
1.476 ms
15.867 ms
1.402 ms
1.373 ms
1.345 ms
6.347 ms
1.348 ms
1.392 ms
1.469 ms
1.354 ms
1.341 ms
9.009 ms
1.392 ms
1.350 ms
5.735 ms
1.353 ms
19.010 ms
1.395 ms
1.481 ms
1.445 ms
1.461 ms
1.336 ms
1.371 ms
1.353 ms
1.363 ms
1.529 ms
1.407 ms
1.356 ms
1.349 ms
1.445 ms
1.411 ms
2.095 ms
1.735 ms
8.992 ms
1.342 ms
5.444 ms
1.330 ms
1.360 ms
1.333 ms
1.415 ms
1.359 ms
1.332 ms
1.356 ms
1.382 ms
1.348 ms
1.396 ms
16.974 ms
1.396 ms
1.347 ms
1.330 ms
1.427 ms
1.336 ms
1.348 ms
1.337 ms
1.395 ms
1.435 ms
1.382 ms
1.380 ms
1.349 ms
1.459 ms
1.329 ms
1.371 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 hop0.113 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.183 msReply RTT AS8002 · Stealth
Before

TCP traceroute / 443 · Recorded address 2

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.183 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.346 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 hop1.975 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination1.516 msReply RTT AS13335 · Cloudflare
Before

ICMP traceroute · Recorded address 2

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.115 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.207 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop7.236 msReply RTT AS13335 · Cloudflare
  4. TTL 4 Probe hop1.573 msReply RTT AS13335 · Cloudflare
  5. TTL 5 Probe hop1.433 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination1.567 msReply RTT AS13335 · Cloudflare
Before

TCP traceroute / 443 · Recorded address 1

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.232 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.193 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 hop5.712 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination1.094 msReply RTT AS13335 · Cloudflare
Before

TCP traceroute / 443 · Recorded address 2

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.139 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.186 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 hop2.691 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination1.097 msReply RTT AS13335 · Cloudflare
During

ICMP traceroute · Recorded address 2

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.166 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.179 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop1.001 msReply RTT AS13335 · Cloudflare
During

TCP traceroute / 443 · Recorded address 2

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.163 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.182 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop46.185 msReply RTT AS13335 · Cloudflare
  4. TTL 4 Probe hopNo replyNo comparable RTT ASN unavailable
  5. TTL 5 Probe hop18.623 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination10.083 msReply RTT AS13335 · Cloudflare
During

ICMP traceroute · Recorded address 2

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.142 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.225 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop1.725 msReply RTT ASN unavailable
  4. TTL 4 Probe hop3.964 msReply RTT AS13335 · Cloudflare
  5. TTL 5 Probe hop1.583 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination1.389 msReply RTT AS13335 · Cloudflare
During

TCP traceroute / 443 · Recorded address 1

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.135 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.181 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop1.493 msReply RTT ASN unavailable
  4. TTL 4 Probe hopNo replyNo comparable RTT ASN unavailable
  5. TTL 5 Probe hop1.987 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Probe hopNo replyNo comparable RTT ASN unavailable
  7. TTL 7 Destination1.882 msReply RTT AS13335 · Cloudflare
During

ICMP traceroute · Recorded address 1

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.126 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.192 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop9.510 msReply RTT AS13335 · Cloudflare
During

TCP traceroute / 443 · Recorded address 2

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.156 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.202 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop0.893 msReply RTT AS13335 · Cloudflare
  4. TTL 4 Probe hopNo replyNo comparable RTT ASN unavailable
  5. TTL 5 Probe hop2.281 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination2.718 msReply RTT AS13335 · Cloudflare
After

ICMP traceroute · Recorded address 1

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.127 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.183 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop2.008 msReply RTT AS13335 · Cloudflare
After

TCP traceroute / 443 · Recorded address 2

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.204 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.184 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop1.674 msReply RTT AS13335 · Cloudflare
  4. TTL 4 Probe hopNo replyNo comparable RTT ASN unavailable
  5. TTL 5 Probe hop2.019 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination1.346 msReply RTT AS13335 · Cloudflare
After

ICMP traceroute · Recorded address 1

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.127 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.181 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop1.315 msReply RTT ASN unavailable
After

TCP traceroute / 443 · Recorded address 1

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.164 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.184 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop1.109 msReply RTT ASN unavailable
  4. TTL 4 Probe hopNo replyNo comparable RTT ASN unavailable
  5. TTL 5 Probe hop7.022 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination1.560 msReply RTT AS13335 · Cloudflare
After

ICMP traceroute · Recorded address 2

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.145 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.207 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop9.682 msReply RTT ASN unavailable
After

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 hop0.178 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop9.542 msReply RTT ASN unavailable
  4. TTL 4 Probe hop4.465 msReply RTT AS13335 · Cloudflare
  5. TTL 5 Probe hop2.778 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination6.072 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
10.113 msAS8002 · Stealth0.126 msAS8002 · StealthSame responder
20.183 msAS8002 · Stealth0.192 msAS8002 · StealthSame responder
3Not recorded9.510 msAS13335 · CloudflareNot 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
10.115 msAS8002 · Stealth0.166 msAS8002 · StealthSame responder
20.207 msAS8002 · Stealth0.179 msAS8002 · StealthSame responder
37.236 msAS13335 · Cloudflare1.001 msAS13335 · CloudflareSame responder
41.573 msAS13335 · CloudflareNot recordedNot established
51.433 msAS13335 · CloudflareNot recordedNot established
61.567 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
10.232 msAS8002 · Stealth0.135 msAS8002 · StealthSame responder
20.193 msAS8002 · Stealth0.181 msAS8002 · StealthSame responder
3No reply1.493 msNot established
4No replyNo replyNot established
55.712 msAS13335 · Cloudflare1.987 msAS13335 · CloudflareSame responder
61.094 msAS13335 · CloudflareNo replyNot established
7Not recorded1.882 msAS13335 · CloudflareNot 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
10.139 msAS8002 · Stealth0.163 msAS8002 · StealthSame responder
20.186 msAS8002 · Stealth0.182 msAS8002 · StealthSame responder
3No reply46.185 msAS13335 · CloudflareNot established
4No replyNo replyNot established
52.691 msAS13335 · Cloudflare18.623 msAS13335 · CloudflareDifferent responders
61.097 msAS13335 · Cloudflare10.083 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 RTT1.367 msUsual round trip before the event
Last recorded event RTT1.333 msLast successful event recording
Event p95 RTT16.498 ms95th percentile of successful recordings
Change from baseline-0.033 msLast event RTT compared with the baseline
Successful / expected recordings369 / 370Recorded 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