CloudWatch · Evidence-led investigation
mermaid-prod-alb-p95-latency
At a glance
Severity: LowMonitor
Prod ALB p95 latency alarm went off for about 1 minute (02:42–02:43 UTC, Oct 17). A few slow requests during low traffic caused it. No errors, unhealthy hosts or DB strain were seen. Cause not proven; the alarm is OK now.
A small number of API requests took roughly 26–40 s; most requests were unaffected.
Diagnosis
Prod ALB p95 latency alarm went off for about 1 minute (02:42–02:43 UTC, Oct 17). A few slow requests during low traffic caused it. No errors, unhealthy hosts or DB strain were seen. Cause not proven; the alarm is OK now.
Not proven. The metrics suggest a few slow requests (max 27–40 s) during a low-traffic window (21–43 requests per 5 min). With so few requests, 1–2 slow ones are enough to push p95 over 5 s. Median latency stayed around 10–40 ms, there were no target or ELB 5xx errors, all hosts stayed healthy, and the RDS database looked normal. Which endpoint or request was slow is unknown.
Timeline
- 2026-10-16 ~21:27–21:32 UTC (14:27 PDT): an earlier p95 spike of 28.2 s with only 5 samples in the next window; the alarm stayed OK (E001)
- 2026-10-15 14:02–14:40 PDT: the last ECS deployment (task definition :99) finished, more than a day before the incident (E018)
- 2026-10-16 19:12–19:18 PDT: busier traffic (189–295 requests per 5 min), 1-minute max latency up to 11 s; RDS CPU peaked at 90.5% in the 19:17 window without breaching the alarm (E005, E014, E020)
- 19:33–19:37 PDT: isolated 1-minute max latencies of 27.4 s, 30.8 s and 39.9 s while traffic was low (37–43 requests per 5 min); p50 stayed at ~9–36 ms (E005, E020)
- 19:42:08 PDT (02:42 UTC): alarm went OK→ALARM with p95 values of 26.2 s and 5.59 s from 35 and 39 samples (E001)
- 19:43:08 PDT: alarm went back to OK at p95 1.32 s (E006)
- 20:00–20:09 PDT: as traffic rose, 1-minute max latency was 4–12 s again, but p95 stayed under 5 s (E003, E020)
- 2026-10-18 17:56 UTC: alarm is OK; the previous datapoint was 5.86 s, so p95 periodically gets near the threshold (E002)
Alternative explanations
- Particular expensive API endpoints (e.g. summary or export queries) that are slow on their own. The RDS CPU spike at 19:17 hints at heavy queries, but RDS was idle during the alarm window (E014)
- Gunicorn worker saturation or blocking on one of the 2 API tasks; not checked because there are no app logs or per-task metrics
- Slow clients or large response payloads; the ALB measures target response time, so this is less likely
Unknowns and missing evidence
- Which requests or endpoints were slow: the API container log group has storedBytes=0 and returned no events (E017, E019), and ALB access logs were not checked
- Container CPU/memory for the API tasks at the time of the incident
- Whether the code at repository HEAD (E004) matches deployed task definition :99
- Whether the users of these slow requests noticed or were affected
Recommended actions
- Find where the prod API's application logs actually go (the ADOT collector or another log group); the configured MermaidAPI log group is empty
- Enable or check ALB access logs to find the request paths behind the 27–40 s responses
- Consider tuning the alarm for low traffic: a minimum sample count, a longer evaluation window, or a p99/p90 alongside a request-count condition, so 1–2 slow requests at night don't page
- Check whether the 21:27 UTC and 02:30 UTC spikes recur daily (e.g. a scheduled job or client)
Fixes and validation
No draft PRs created.
Context and provenance
{
"repositories": {
"data-mermaid/mermaid-api": {
"name": "data-mermaid/mermaid-api",
"branch": "master",
"sha": "a23d9e97f6bc083866d8290fb68dc7e2727074fd",
"path": "/home/dustin/projects/mermaid/alarm-monitor/data/repos/data-mermaid/mermaid-api/a23d9e97f6bc083866d8290fb68dc7e2727074fd",
"checked_at": 1792348623.1334283
},
"data-mermaid/mermaid-webapp": {
"name": "data-mermaid/mermaid-webapp",
"branch": "develop",
"sha": "28f4b7f3c35c78fc8dbfc0543547efd8eb75988e",
"path": "/home/dustin/projects/mermaid/alarm-monitor/data/repos/data-mermaid/mermaid-webapp/28f4b7f3c35c78fc8dbfc0543547efd8eb75988e",
"checked_at": 1792348625.2455728
},
"data-mermaid/mermaid-dash-v2": {
"name": "data-mermaid/mermaid-dash-v2",
"branch": "develop",
"sha": "7f025ca484f2166ef5f125812975b6b87c958574",
"path": "/home/dustin/projects/mermaid/alarm-monitor/data/repos/data-mermaid/mermaid-dash-v2/7f025ca484f2166ef5f125812975b6b87c958574",
"checked_at": 1792348626.434717
}
},
"documents": [
"data-mermaid/mermaid-api",
"data-mermaid/mermaid-webapp",
"data-mermaid/mermaid-dash-v2"
],
"errors": []
}Evidence
E001 · alarm_event
{
"id": "E001",
"source": "alarm_event",
"collected_at": "2026-10-18T18:37:06.435173+00:00",
"error": false,
"arguments": {},
"result": {
"AlarmName": "mermaid-prod-alb-p95-latency",
"AlarmType": "MetricAlarm",
"Timestamp": "2026-10-16T19:42:08.155000-07:00",
"HistoryItemType": "StateUpdate",
"HistorySummary": "Alarm updated from OK to ALARM",
"HistoryData": "{\"version\": \"1.0\", \"oldState\": {\"stateValue\": \"OK\", \"stateReason\": \"Threshold Crossed: 1 datapoint [0.00821624621003254 (16/10/26 21:32:00)] was not greater than the threshold (5.0).\", \"stateReasonData\": {\"version\": \"1.0\", \"queryDate\": \"2026-10-16T21:39:08.152+0000\", \"startDate\": \"2026-10-16T21:27:00.000+0000\", \"statistic\": \"p95\", \"period\": 300, \"recentDatapoints\": [28.216159219919543, 0.00821624621003254], \"threshold\": 5.0, \"evaluatedDatapoints\": [{\"timestamp\": \"2026-10-16T21:32:00.000+0000\", \"sampleCount\": 5.0, \"value\": 0.00821624621003254}]}}, \"newState\": {\"stateValue\": \"ALARM\", \"stateReason\": \"Threshold Crossed: 2 datapoints [5.586476382913405 (17/10/26 02:35:00), 26.163718429757992 (17/10/26 02:30:00)] were greater than the threshold (5.0).\", \"stateReasonData\": {\"version\": \"1.0\", \"queryDate\": \"2026-10-17T02:42:08.154+0000\", \"startDate\": \"2026-10-17T02:30:00.000+0000\", \"statistic\": \"p95\", \"period\": 300, \"recentDatapoints\": [26.163718429757992, 5.586476382913405], \"threshold\": 5.0, \"evaluatedDatapoints\": [{\"timestamp\": \"2026-10-17T02:35:00.000+0000\", \"sampleCount\": 39.0, \"value\": 5.586476382913405}, {\"timestamp\": \"2026-10-17T02:30:00.000+0000\", \"sampleCount\": 35.0, \"value\": 26.163718429757992}]}}}"
}
}E002 · aws
{
"id": "E002",
"source": "aws",
"collected_at": "2026-10-18T18:37:06.714104+00:00",
"error": false,
"arguments": {
"service": "cloudwatch",
"operation": "describe_alarms",
"parameters": {
"AlarmNames": [
"mermaid-prod-alb-p95-latency"
],
"AlarmTypes": [
"MetricAlarm"
]
}
},
"result": {
"CompositeAlarms": [],
"MetricAlarms": [
{
"AlarmName": "mermaid-prod-alb-p95-latency",
"AlarmArn": "arn:aws:cloudwatch:us-east-1:554812291621:alarm:mermaid-prod-alb-p95-latency",
"AlarmDescription": "ALB p95 response latency exceeded 5 seconds",
"AlarmConfigurationUpdatedTimestamp": "2026-08-17 11:19:08.581000-07:00",
"ActionsEnabled": true,
"OKActions": [
"arn:aws:sns:us-east-1:554812291621:mermaid-prod-alerts"
],
"AlarmActions": [
"arn:aws:sns:us-east-1:554812291621:mermaid-prod-alerts"
],
"InsufficientDataActions": [],
"StateValue": "OK",
"StateReason": "Threshold Crossed: 1 datapoint [0.07627768444385458 (18/10/26 17:49:00)] was not greater than the threshold (5.0).",
"StateReasonData": "{\"version\": \"1.0\", \"queryDate\": \"2026-10-18T17:56:08.151+0000\", \"startDate\": \"2026-10-18T17:44:00.000+0000\", \"statistic\": \"p95\", \"period\": 300, \"recentDatapoints\": [5.859145860493163, 0.07627768444385458], \"threshold\": 5.0, \"evaluatedDatapoints\": [{\"timestamp\": \"2026-10-18T17:49:00.000+0000\", \"sampleCount\": 20.0, \"value\": 0.07627768444385458}]}",
"StateUpdatedTimestamp": "2026-10-18 10:56:08.153000-07:00",
"MetricName": "TargetResponseTime",
"Namespace": "AWS/ApplicationELB",
"ExtendedStatistic": "p95",
"Dimensions": [
{
"Name": "LoadBalancer",
"Value": "app/merma-Merma-7G2ZIRYPYQN4/8838074e02959036"
},
{
"Name": "TargetGroup",
"Value": "targetgroup/prod-Targe-CSU397AXK7ZR/18376b322fd7b9c8"
}
],
"Period": 300,
"EvaluationPeriods": 2,
"Threshold": 5.0,
"ComparisonOperator": "GreaterThanThreshold",
"TreatMissingData": "notBreaching",
"StateTransitionedTimestamp": "2026-10-18 10:56:08.153000-07:00"
}
],
"LogAlarms": []
}
}E003 · aws
{
"id": "E003",
"source": "aws",
"collected_at": "2026-10-18T18:37:07.051005+00:00",
"error": false,
"arguments": {
"service": "cloudwatch",
"operation": "get_metric_data",
"parameters": {
"MetricDataQueries": [
{
"Id": "alarm_metric",
"ReturnData": true,
"MetricStat": {
"Metric": {
"Namespace": "AWS/ApplicationELB",
"MetricName": "TargetResponseTime",
"Dimensions": [
{
"Name": "LoadBalancer",
"Value": "app/merma-Merma-7G2ZIRYPYQN4/8838074e02959036"
},
{
"Name": "TargetGroup",
"Value": "targetgroup/prod-Targe-CSU397AXK7ZR/18376b322fd7b9c8"
}
]
},
"Period": 300,
"Stat": "p95"
}
}
]
}
},
"result": {
"MetricDataResults": [
{
"Id": "alarm_metric",
"Label": "TargetResponseTime",
"Timestamps": [
"2026-10-16 20:07:00-07:00",
"2026-10-16 20:02:00-07:00",
"2026-10-16 19:57:00-07:00",
"2026-10-16 19:52:00-07:00",
"2026-10-16 19:47:00-07:00",
"2026-10-16 19:42:00-07:00",
"2026-10-16 19:37:00-07:00",
"2026-10-16 19:32:00-07:00",
"2026-10-16 19:27:00-07:00",
"2026-10-16 19:22:00-07:00",
"2026-10-16 19:17:00-07:00",
"2026-10-16 19:12:00-07:00"
],
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2.053594880274503,
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],
"StatusCode": "Complete"
}
],
"Messages": []
}
}E004 · repository_snapshots
{
"id": "E004",
"source": "repository_snapshots",
"collected_at": "2026-10-18T18:37:07.051166+00:00",
"error": false,
"arguments": {},
"result": {
"data-mermaid/mermaid-api": {
"sha": "a23d9e97f6bc083866d8290fb68dc7e2727074fd",
"branch": "master",
"checked_at": 1792348623.1334283
},
"data-mermaid/mermaid-webapp": {
"sha": "28f4b7f3c35c78fc8dbfc0543547efd8eb75988e",
"branch": "develop",
"checked_at": 1792348625.2455728
},
"data-mermaid/mermaid-dash-v2": {
"sha": "7f025ca484f2166ef5f125812975b6b87c958574",
"branch": "develop",
"checked_at": 1792348626.434717
}
}
}E005 · aws
{
"id": "E005",
"source": "aws",
"collected_at": "2026-10-18T18:37:33.640585+00:00",
"error": false,
"arguments": {
"service": "cloudwatch",
"operation": "get_metric_data",
"parameters": {
"MetricDataQueries": [
{
"Id": "req",
"ReturnData": true,
"MetricStat": {
"Metric": {
"Namespace": "AWS/ApplicationELB",
"MetricName": "RequestCount",
"Dimensions": [
{
"Name": "LoadBalancer",
"Value": "app/merma-Merma-7G2ZIRYPYQN4/8838074e02959036"
},
{
"Name": "TargetGroup",
"Value": "targetgroup/prod-Targe-CSU397AXK7ZR/18376b322fd7b9c8"
}
]
},
"Period": 300,
"Stat": "Sum"
}
},
{
"Id": "t5xx",
"ReturnData": true,
"MetricStat": {
"Metric": {
"Namespace": "AWS/ApplicationELB",
"MetricName": "HTTPCode_Target_5XX_Count",
"Dimensions": [
{
"Name": "LoadBalancer",
"Value": "app/merma-Merma-7G2ZIRYPYQN4/8838074e02959036"
},
{
"Name": "TargetGroup",
"Value": "targetgroup/prod-Targe-CSU397AXK7ZR/18376b322fd7b9c8"
}
]
},
"Period": 300,
"Stat": "Sum"
}
},
{
"Id": "p50",
"ReturnData": true,
"MetricStat": {
"Metric": {
"Namespace": "AWS/ApplicationELB",
"MetricName": "TargetResponseTime",
"Dimensions": [
{
"Name": "LoadBalancer",
"Value": "app/merma-Merma-7G2ZIRYPYQN4/8838074e02959036"
},
{
"Name": "TargetGroup",
"Value": "targetgroup/prod-Targe-CSU397AXK7ZR/18376b322fd7b9c8"
}
]
},
"Period": 300,
"Stat": "p50"
}
},
{
"Id": "mx",
"ReturnData": true,
"MetricStat": {
"Metric": {
"Namespace": "AWS/ApplicationELB",
"MetricName": "TargetResponseTime",
"Dimensions": [
{
"Name": "LoadBalancer",
"Value": "app/merma-Merma-7G2ZIRYPYQN4/8838074e02959036"
},
{
"Name": "TargetGroup",
"Value": "targetgroup/prod-Targe-CSU397AXK7ZR/18376b322fd7b9c8"
}
]
},
"Period": 300,
"Stat": "Maximum"
}
},
{
"Id": "unh",
"ReturnData": true,
"MetricStat": {
"Metric": {
"Namespace": "AWS/ApplicationELB",
"MetricName": "UnHealthyHostCount",
"Dimensions": [
{
"Name": "LoadBalancer",
"Value": "app/merma-Merma-7G2ZIRYPYQN4/8838074e02959036"
},
{
"Name": "TargetGroup",
"Value": "targetgroup/prod-Targe-CSU397AXK7ZR/18376b322fd7b9c8"
}
]
},
"Period": 300,
"Stat": "Maximum"
}
}
]
}
},
"result": {
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{
"Id": "req",
"Label": "RequestCount",
"Timestamps": [
"2026-10-16 20:07:00-07:00",
"2026-10-16 20:02:00-07:00",
"2026-10-16 19:57:00-07:00",
"2026-10-16 19:52:00-07:00",
"2026-10-16 19:47:00-07:00",
"2026-10-16 19:42:00-07:00",
"2026-10-16 19:37:00-07:00",
"2026-10-16 19:32:00-07:00",
"2026-10-16 19:27:00-07:00",
"2026-10-16 19:22:00-07:00",
"2026-10-16 19:17:00-07:00",
"2026-10-16 19:12:00-07:00"
],
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21.0,
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295.0
],
"StatusCode": "Complete"
},
{
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"Label": "HTTPCode_Target_5XX_Count",
"Timestamps": [],
"Values": [],
"StatusCode": "Complete"
},
{
"Id": "p50",
"Label": "TargetResponseTime p50",
"Timestamps": [
"2026-10-16 20:07:00-07:00",
"2026-10-16 20:02:00-07:00",
"2026-10-16 19:57:00-07:00",
"2026-10-16 19:52:00-07:00",
"2026-10-16 19:47:00-07:00",
"2026-10-16 19:42:00-07:00",
"2026-10-16 19:37:00-07:00",
"2026-10-16 19:32:00-07:00",
"2026-10-16 19:27:00-07:00",
"2026-10-16 19:22:00-07:00",
"2026-10-16 19:17:00-07:00",
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"StatusCode": "Complete"
},
{
"Id": "mx",
"Label": "TargetResponseTime Maximum",
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"2026-10-16 20:02:00-07:00",
"2026-10-16 19:57:00-07:00",
"2026-10-16 19:52:00-07:00",
"2026-10-16 19:47:00-07:00",
"2026-10-16 19:42:00-07:00",
"2026-10-16 19:37:00-07:00",
"2026-10-16 19:32:00-07:00",
"2026-10-16 19:27:00-07:00",
"2026-10-16 19:22:00-07:00",
"2026-10-16 19:17:00-07:00",
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],
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"StatusCode": "Complete"
},
{
"Id": "unh",
"Label": "UnHealthyHostCount",
"Timestamps": [
"2026-10-16 20:07:00-07:00",
"2026-10-16 20:02:00-07:00",
"2026-10-16 19:57:00-07:00",
"2026-10-16 19:52:00-07:00",
"2026-10-16 19:47:00-07:00",
"2026-10-16 19:42:00-07:00",
"2026-10-16 19:37:00-07:00",
"2026-10-16 19:32:00-07:00",
"2026-10-16 19:27:00-07:00",
"2026-10-16 19:22:00-07:00",
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],
"StatusCode": "Complete"
}
],
"Messages": []
}
}E006 · aws
{
"id": "E006",
"source": "aws",
"collected_at": "2026-10-18T18:37:33.899072+00:00",
"error": false,
"arguments": {
"service": "cloudwatch",
"operation": "describe_alarm_history",
"parameters": {
"AlarmName": "mermaid-prod-alb-p95-latency",
"HistoryItemType": "StateUpdate",
"MaxRecords": 50
}
},
"result": {
"AlarmHistoryItems": [
{
"AlarmName": "mermaid-prod-alb-p95-latency",
"AlarmType": "MetricAlarm",
"Timestamp": "2026-10-16 19:43:08.154000-07:00",
"HistoryItemType": "StateUpdate",
"HistorySummary": "Alarm updated from ALARM to OK",
"HistoryData": "{\"version\": \"1.0\", \"oldState\": {\"stateValue\": \"ALARM\", \"stateReason\": \"Threshold Crossed: 2 datapoints [5.586476382913405 (17/10/26 02:35:00), 26.163718429757992 (17/10/26 02:30:00)] were greater than the threshold (5.0).\", \"stateReasonData\": {\"version\": \"1.0\", \"queryDate\": \"2026-10-17T02:42:08.154+0000\", \"startDate\": \"2026-10-17T02:30:00.000+0000\", \"statistic\": \"p95\", \"period\": 300, \"recentDatapoints\": [26.163718429757992, 5.586476382913405], \"threshold\": 5.0, \"evaluatedDatapoints\": [{\"timestamp\": \"2026-10-17T02:35:00.000+0000\", \"sampleCount\": 39.0, \"value\": 5.586476382913405}, {\"timestamp\": \"2026-10-17T02:30:00.000+0000\", \"sampleCount\": 35.0, \"value\": 26.163718429757992}]}}, \"newState\": {\"stateValue\": \"OK\", \"stateReason\": \"Threshold Crossed: 1 datapoint [1.3183744776835287 (17/10/26 02:36:00)] was not greater than the threshold (5.0).\", \"stateReasonData\": {\"version\": \"1.0\", \"queryDate\": \"2026-10-17T02:43:08.152+0000\", \"startDate\": \"2026-10-17T02:31:00.000+0000\", \"statistic\": \"p95\", \"period\": 300, \"recentDatapoints\": [25.915536152585346, 1.3183744776835287], \"threshold\": 5.0, \"evaluatedDatapoints\": [{\"timestamp\": \"2026-10-17T02:36:00.000+0000\", \"sampleCount\": 42.0, \"value\": 1.3183744776835287}]}}}"
},
{
"AlarmName": "mermaid-prod-alb-p95-latency",
"AlarmType": "MetricAlarm",
"Timestamp": "2026-10-16 19:42:08.155000-07:00",
"HistoryItemType": "StateUpdate",
"HistorySummary": "Alarm updated from OK to ALARM",
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}
]
}
}E007 · aws
{
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"arguments": {
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],
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}
]
}
}E008 · aws
{
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}E009 · read_evidence
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}E010 · aws
{
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}E011 · aws
{
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{
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}E012 · search
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}E013 · read_evidence
{
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}E014 · aws
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}E015 · aws
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}E016 · aws
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}
}E017 · aws
{
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]
}
}E018 · aws
{
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},
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}E019 · aws
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}E020 · aws
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