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Root cause analysis / Investigation

api.openai.com

Reference RCA-15BBCA62E6718CEF

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

28 Oct 2026 13:05 – 28 Oct 2026 19:19 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
1.420 ms
1.699 ms
1.420 ms
1.407 ms
1.489 ms
1.393 ms
1.418 ms
1.351 ms
1.339 ms
1.389 ms
1.339 ms
1.366 ms
1.388 ms
1.377 ms
1.404 ms
1.400 ms
1.331 ms
1.370 ms
1.512 ms
1.408 ms
1.378 ms
1.338 ms
1.350 ms
1.470 ms
1.371 ms
5.260 ms
1.434 ms
1.379 ms
1.358 ms
1.408 ms
1.360 ms
1.374 ms
1.436 ms
1.372 ms
1.428 ms
1.341 ms
1.383 ms
1.423 ms
1.374 ms
1.368 ms
1.380 ms
1.376 ms
1.416 ms
1.427 ms
1.529 ms
1.377 ms
1.377 ms
1.325 ms
1.394 ms
1.409 ms
1.396 ms
1.353 ms
1.380 ms
1.501 ms
1.360 ms
1.349 ms
1.394 ms
1.354 ms
1.365 ms
1.564 ms
2.555 ms
1.350 ms
10.879 ms
3.075 ms
15.341 ms
1.405 ms
1.392 ms
1.355 ms
1.465 ms
1.454 ms
1.360 ms
1.352 ms
1.362 ms
1.456 ms
1.408 ms
1.341 ms
1.380 ms
1.369 ms
1.692 ms
1.362 ms
13.473 ms
1.371 ms
1.373 ms
1.357 ms
19.170 ms
1.371 ms
1.858 ms
1.433 ms
1.406 ms
6.545 ms
1.358 ms
3.109 ms
1.365 ms
1.428 ms
1.355 ms
1.384 ms
4.423 ms
17.911 ms
1.369 ms
1.355 ms
1.419 ms
1.361 ms
1.479 ms
1.416 ms
1.353 ms
1.409 ms
1.364 ms
1.404 ms
1.389 ms
1.384 ms
3.550 ms
1.414 ms
1.406 ms
1.384 ms
1.422 ms
1.367 ms
1.356 ms
1.327 ms
2.815 ms
1.378 ms
1.378 ms
1.517 ms
14.826 ms
1.654 ms
1.397 ms
1.417 ms
14.806 ms
1.347 ms
1.516 ms
5.135 ms
1.328 ms
1.354 ms
5.564 ms
1.510 ms
1.391 ms
5.822 ms
4.070 ms
14.108 ms
1.462 ms
1.450 ms
1.401 ms
1.402 ms
1.397 ms
1.652 ms
1.311 ms
15.833 ms
1.395 ms
19.796 ms
1.401 ms
15.400 ms
2.238 ms
1.474 ms
6.750 ms
15.324 ms
2.604 ms
1.382 ms
1.467 ms
1.466 ms
1.368 ms
1.484 ms
1.482 ms
5.456 ms
17.939 ms
17.999 ms
1.365 ms
1.455 ms
1.403 ms
1.384 ms
18.541 ms
7.034 ms
1.393 ms
1.428 ms
1.390 ms
1.849 ms
9.604 ms
1.332 ms
1.346 ms
1.378 ms
1.397 ms
1.529 ms
1.420 ms
2.949 ms
1.388 ms
1.511 ms
1.381 ms
17.763 ms
1.396 ms
1.422 ms
1.408 ms
1.401 ms
1.460 ms
18.101 ms
19.573 ms
17.407 ms
1.342 ms
1.513 ms
1.407 ms
11.669 ms
1.324 ms
5.024 ms
20.320 ms
12.652 ms
19.614 ms
1.367 ms
1.661 ms
1.498 ms
1.487 ms
1.358 ms
1.491 ms
13.338 ms
1.438 ms
1.360 ms
1.365 ms
17.199 ms
1.368 ms
1.400 ms
1.417 ms
1.364 ms
1.397 ms
1.465 ms
1.384 ms
1.443 ms
1.346 ms
1.394 ms
9.211 ms
11.561 ms
1.384 ms
1.357 ms
13.232 ms
1.445 ms
1.392 ms
1.433 ms
1.364 ms
1.372 ms
1.540 ms
1.403 ms
1.409 ms
1.544 ms
1.421 ms
1.404 ms
1.342 ms
1.426 ms
15.837 ms
1.451 ms
1.354 ms
1.407 ms
1.486 ms
1.544 ms
1.360 ms
1.346 ms
1.463 ms
1.424 ms
1.360 ms
1.384 ms
1.388 ms
1.412 ms
1.358 ms
1.401 ms
1.343 ms
1.457 ms
1.356 ms
1.378 ms
1.353 ms
1.382 ms
1.310 ms
1.385 ms
1.356 ms
15.188 ms
8.730 ms
1.433 ms
1.390 ms
1.397 ms
1.387 ms
1.400 ms
1.396 ms
8.384 ms
12.484 ms
17.011 ms
12.398 ms
1.381 ms
1.491 ms
1.330 ms
1.477 ms
2.686 ms
1.442 ms
1.419 ms
6.993 ms
1.376 ms
1.478 ms
1.587 ms
1.367 ms
1.375 ms
19.758 ms
1.409 ms
1.352 ms
3.731 ms
1.444 ms
1.351 ms
1.357 ms
1.481 ms
1.343 ms
1.445 ms
1.376 ms
1.388 ms
1.441 ms
1.381 ms
1.391 ms
1.432 ms
1.362 ms
1.630 ms
1.413 ms
8.921 ms
1.500 ms
19.860 ms
8.143 ms
1.483 ms
1.337 ms
1.485 ms
1.361 ms
1.380 ms
15.915 ms
17.493 ms
1.362 ms
1.436 ms
1.519 ms
1.362 ms
1.354 ms
1.476 ms
1.416 ms
1.357 ms
1.316 ms
6.371 ms
1.422 ms
1.430 ms
1.448 ms
2.789 ms
1.362 ms
1.440 ms
1.618 ms
1.352 ms
1.380 ms
3.420 ms
1.377 ms
1.336 ms
1.390 ms
1.398 ms
1.385 ms
1.375 ms
1.347 ms
1.363 ms
12.621 ms
1.345 ms
1.443 ms
1.501 ms
1.510 ms
1.369 ms
1.358 ms
1.356 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 not reached by this trace


to UTC

  1. TTL 1 Probe hop0.130 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.181 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop1.340 msReply RTT AS13335 · Cloudflare
Before

TCP traceroute / 443 · Recorded address 1

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.177 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.379 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop28.116 msReply RTT AS13335 · Cloudflare
  4. TTL 4 Probe hopNo replyNo comparable RTT ASN unavailable
  5. TTL 5 Probe hop1.737 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination1.518 msReply RTT AS13335 · Cloudflare
Before

ICMP traceroute · Recorded address 1

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.140 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.188 msReply RTT AS8002 · Stealth
Before

TCP traceroute / 443 · Recorded address 1

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.158 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.189 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop4.012 msReply RTT AS13335 · Cloudflare
  4. TTL 4 Probe hopNo replyNo comparable RTT ASN unavailable
  5. TTL 5 Probe hop1.540 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination1.529 msReply RTT AS13335 · Cloudflare
Before

ICMP traceroute · Recorded address 1

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.135 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.177 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop5.251 msReply RTT ASN unavailable
  4. TTL 4 Probe hop21.960 msReply RTT AS13335 · Cloudflare
  5. TTL 5 Probe hop1.968 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination2.173 msReply RTT AS13335 · Cloudflare
Before

TCP traceroute / 443 · Recorded address 1

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.193 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.208 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop5.894 msReply RTT ASN unavailable
  4. TTL 4 Probe hopNo replyNo comparable RTT ASN unavailable
  5. TTL 5 Probe hop1.236 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination1.148 msReply RTT AS13335 · Cloudflare
During

ICMP traceroute · Recorded address 1

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.135 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.183 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop8.632 msReply RTT ASN unavailable
During

TCP traceroute / 443 · Recorded address 2

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.205 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.216 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop6.243 msReply RTT ASN unavailable
  4. TTL 4 Probe hopNo replyNo comparable RTT ASN unavailable
  5. TTL 5 Probe hop6.136 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Probe hopNo replyNo comparable RTT ASN unavailable
  7. TTL 7 Destination1.871 msReply RTT AS13335 · Cloudflare
During

ICMP traceroute · Recorded address 2

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.176 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.167 msReply RTT AS8002 · Stealth
During

TCP traceroute / 443 · Recorded address 1

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.182 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.263 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 hop2.926 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination1.205 msReply RTT AS13335 · Cloudflare
During

ICMP traceroute · Recorded address 2

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.115 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.179 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop7.070 msReply RTT AS13335 · Cloudflare
During

TCP traceroute / 443 · Recorded address 1

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.175 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.253 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop2.953 msReply RTT AS13335 · Cloudflare
  4. TTL 4 Probe hopNo replyNo comparable RTT ASN unavailable
  5. TTL 5 Probe hop12.000 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination1.355 msReply RTT AS13335 · Cloudflare
After

ICMP traceroute · Recorded address 1

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.116 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.183 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop0.867 msReply RTT AS13335 · Cloudflare
After

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 hop0.258 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop1.452 msReply RTT AS13335 · Cloudflare
  4. TTL 4 Probe hop3.018 msReply RTT AS13335 · Cloudflare
  5. TTL 5 Probe hop2.255 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Probe hopNo replyNo comparable RTT ASN unavailable
  7. TTL 7 Destination2.105 msReply RTT AS13335 · Cloudflare
After

ICMP traceroute · Recorded address 2

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.160 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.179 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop1.182 msReply RTT ASN unavailable
After

TCP traceroute / 443 · Recorded address 1

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.168 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.180 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop1.511 msReply RTT ASN unavailable
  4. TTL 4 Probe hopNo replyNo comparable RTT ASN unavailable
  5. TTL 5 Probe hop5.503 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination1.523 msReply RTT AS13335 · Cloudflare
After

ICMP traceroute · Recorded address 1

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.120 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.177 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop0.800 msReply RTT AS13335 · Cloudflare
After

TCP traceroute / 443 · Recorded address 1

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.234 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.207 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop3.591 msReply RTT AS13335 · Cloudflare
  4. TTL 4 Probe hopNo replyNo comparable RTT ASN unavailable
  5. TTL 5 Probe hop8.916 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination1.780 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
10.135 msAS8002 · Stealth0.135 msAS8002 · StealthSame responder
20.177 msAS8002 · Stealth0.183 msAS8002 · StealthSame responder
35.251 ms8.632 msSame responder
421.960 msAS13335 · CloudflareNot recordedNot established
51.968 msAS13335 · CloudflareNot recordedNot established
62.173 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
10.130 msAS8002 · Stealth0.176 msAS8002 · StealthSame responder
20.181 msAS8002 · Stealth0.167 msAS8002 · StealthSame responder
31.340 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
10.193 msAS8002 · Stealth0.182 msAS8002 · StealthSame responder
20.208 msAS8002 · Stealth0.263 msAS8002 · StealthSame responder
35.894 msNo replyNot established
4No replyNo replyNot established
51.236 msAS13335 · Cloudflare2.926 msAS13335 · CloudflareDifferent responders
61.148 msAS13335 · Cloudflare1.205 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 RTT1.388 msUsual round trip before the event
Last recorded event RTT1.404 msLast successful event recording
Event p95 RTT17.231 ms95th percentile of successful recordings
Change from baseline+0.015 msLast event RTT compared with the baseline
Successful / expected recordings507 / 510Recorded 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