CloudWatch · Evidence-led investigation
mermaid-prod-alb-p95-latency
At a glance
Severity: MediumMonitor
Prod mermaid-api ALB p95 latency hit 28s around 18:20 UTC on Oct 17 while API CPU peaked at 89% and memory jumped from 23% to 71%. It recovered within a minute with no 5xx errors, but the root cause is unconfirmed and spikes recur.
About 39–106 requests per 5 minutes had multi-second to roughly 30s response times on the prod MERMAID API for around 10 minutes.
Diagnosis
Prod mermaid-api ALB p95 latency hit 28s around 18:20 UTC on Oct 17 while API CPU peaked at 89% and memory jumped from 23% to 71%. It recovered within a minute with no 5xx errors, but the root cause is unconfirmed and spikes recur.
Suspected: the prod mermaid-api tasks hit a short burst of CPU saturation. Max ECS service CPU was 89% at 11:22 PDT, up from about 22–36% (E017). This lined up with p95 at 28.2s and max response time at 31.6s (E003, E005). In the same 5-minute period, memory rose from about 23% to 71% and stayed there after CPU dropped back to about 1% (E017). One possible explanation is a single heavy, memory-intensive request or worker job inside the API tasks, but no request-level or app logs confirm this. The database does not look like the cause: RDS CPU stayed under 10%, connections held at 12–13, read latency was in milliseconds, and CPU credits were full (E012). Infrastructure changes don't explain it either: both targets stayed healthy (E005, E006), there were no target or ELB 5xx errors (E005), and the same two tasks from the Oct 15 deployment kept running with no ECS events during the incident (E015, E020).
Evidence: E001 E002 E003 E005 E006 E010 E012 E015 E017 E018 E019 E020
Timeline
- 2026-10-15 14:02–14:40 PDT: ECS deployed task definition :99, and tasks 321d5e5d… and 46031314… started (E015, E020).
- 2026-10-17 ~02:31 UTC: an earlier p95 spike of 25.9s was recorded, then the alarm returned to OK (E001).
- 2026-10-17 10:57–11:17 PDT: traffic was elevated at 55–199 requests per 5 minutes and p95 was 1–3.2s, with max response time of 6–10.7s (E003, E005).
- 2026-10-17 11:22 PDT period: p95 was 28.8s, max response time 31.6s, ECS CPU max 89%, and memory rose from 23% to 71%. There were no 5xx errors and 2 hosts stayed healthy (E003, E005, E017).
- 2026-10-17 11:27:08 PDT: the alarm went to ALARM. At 11:28:08 PDT it went back to OK (E010).
- 2026-10-17 11:27–11:52 PDT: p95 was about 0.07s, CPU about 1.3%, and memory stayed at about 71% (E003, E017).
- 2026-10-18 17:56 UTC: the alarm is OK, but a recent datapoint of 5.86s shows another brief spike above the threshold (E002).
Alternative explanations
- A heavy client request, such as a large export or report, or a burst from one client caused the CPU and memory spike. This is plausible but unverified.
- A scheduled or background job running in the API container caused the spike. Not verified.
- The memory step-up came from a gunicorn worker recycling or a cache warming up, and only happened at the same time as the latency spike.
Unknowns and missing evidence
- Which endpoint or client caused the slow requests: the API container log group stores 0 bytes and returned no events (E016, E018, E019), and ALB access logs were not checked.
- Why memory stayed at about 71% after the spike, and whether it is still rising (possible leak or OOM risk).
- Container Insights performance logs have 1-day retention and probably no longer cover the incident (E008).
- Whether the deployed image matches repository HEAD. Code was not inspected, so no causal code path is established.
- Whether the recurring spikes (02:31 UTC Oct 17, around 17:44 UTC Oct 18) share the same cause.
Recommended actions
- Check current ECS memory utilization for the prod API service. If it is still near 71% or rising, plan a controlled task restart and investigate a possible leak.
- Turn on ALB access logs and/or make sure the Django or gunicorn app logs reach CloudWatch, so slow endpoints can be identified next time. The current API log group is empty.
- Correlate the recurring p95 spikes with traffic bursts and ADOT traces (the ADOT collector log group exists) to find the slow endpoint.
- Consider raising API task CPU or count, or autoscaling on CPU: with only 2 tasks, CPU saturates during bursts.
Fixes and validation
No draft PRs created.
Context and provenance
{
"repositories": {
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"branch": "master",
"sha": "a23d9e97f6bc083866d8290fb68dc7e2727074fd",
"path": "/home/dustin/projects/mermaid/alarm-monitor/data/repos/data-mermaid/mermaid-api/a23d9e97f6bc083866d8290fb68dc7e2727074fd",
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},
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"data-mermaid/mermaid-api",
"data-mermaid/mermaid-webapp",
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"errors": []
}Evidence
E001 · alarm_event
{
"id": "E001",
"source": "alarm_event",
"collected_at": "2026-10-18T18:38:35.263081+00:00",
"error": false,
"arguments": {},
"result": {
"AlarmName": "mermaid-prod-alb-p95-latency",
"AlarmType": "MetricAlarm",
"Timestamp": "2026-10-17T11:27:08.153000-07:00",
"HistoryItemType": "StateUpdate",
"HistorySummary": "Alarm updated from OK to ALARM",
"HistoryData": "{\"version\": \"1.0\", \"oldState\": {\"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}]}}, \"newState\": {\"stateValue\": \"ALARM\", \"stateReason\": \"Threshold Crossed: 2 datapoints [28.23667887525067 (17/10/26 18:20:00), 5.653430437222395 (17/10/26 18:15:00)] were greater than the threshold (5.0).\", \"stateReasonData\": {\"version\": \"1.0\", \"queryDate\": \"2026-10-17T18:27:08.152+0000\", \"startDate\": \"2026-10-17T18:15:00.000+0000\", \"statistic\": \"p95\", \"period\": 300, \"recentDatapoints\": [5.653430437222395, 28.23667887525067], \"threshold\": 5.0, \"evaluatedDatapoints\": [{\"timestamp\": \"2026-10-17T18:20:00.000+0000\", \"sampleCount\": 39.0, \"value\": 28.23667887525067}, {\"timestamp\": \"2026-10-17T18:15:00.000+0000\", \"sampleCount\": 106.0, \"value\": 5.653430437222395}]}}}"
}
}E002 · aws
{
"id": "E002",
"source": "aws",
"collected_at": "2026-10-18T18:38:35.525394+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": "2026-10-18T18:38:35.903943+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": [
"2026-10-17 11:52:00-07:00",
"2026-10-17 11:47:00-07:00",
"2026-10-17 11:42:00-07:00",
"2026-10-17 11:37:00-07:00",
"2026-10-17 11:32:00-07:00",
"2026-10-17 11:27:00-07:00",
"2026-10-17 11:22:00-07:00",
"2026-10-17 11:17:00-07:00",
"2026-10-17 11:12:00-07:00",
"2026-10-17 11:07:00-07:00",
"2026-10-17 11:02:00-07:00",
"2026-10-17 10:57:00-07:00"
],
"Values": [
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0.07537432138251884,
0.09913508536882662,
0.0733061755742834,
28.7800902727338,
1.47812107484364,
3.198827043208278,
1.0513108818498573,
1.6971858514665312,
3.214107462811053
],
"StatusCode": "Complete"
}
],
"Messages": []
}
}E004 · repository_snapshots
{
"id": "E004",
"source": "repository_snapshots",
"collected_at": "2026-10-18T18:38:35.904095+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": "2026-10-18T18:38:51.586083+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": "healthy",
"ReturnData": true,
"MetricStat": {
"Metric": {
"Namespace": "AWS/ApplicationELB",
"MetricName": "HealthyHostCount",
"Dimensions": [
{
"Name": "LoadBalancer",
"Value": "app/merma-Merma-7G2ZIRYPYQN4/8838074e02959036"
},
{
"Name": "TargetGroup",
"Value": "targetgroup/prod-Targe-CSU397AXK7ZR/18376b322fd7b9c8"
}
]
},
"Period": 300,
"Stat": "Minimum"
}
},
{
"Id": "tmax",
"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": "elb5xx",
"ReturnData": true,
"MetricStat": {
"Metric": {
"Namespace": "AWS/ApplicationELB",
"MetricName": "HTTPCode_ELB_5XX_Count",
"Dimensions": [
{
"Name": "LoadBalancer",
"Value": "app/merma-Merma-7G2ZIRYPYQN4/8838074e02959036"
}
]
},
"Period": 300,
"Stat": "Sum"
}
}
]
}
},
"result": {
"MetricDataResults": [
{
"Id": "req",
"Label": "targetgroup/prod-Targe-CSU397AXK7ZR/18376b322fd7b9c8 RequestCount",
"Timestamps": [
"2026-10-17 11:52:00-07:00",
"2026-10-17 11:47:00-07:00",
"2026-10-17 11:42:00-07:00",
"2026-10-17 11:37:00-07:00",
"2026-10-17 11:32:00-07:00",
"2026-10-17 11:27:00-07:00",
"2026-10-17 11:22:00-07:00",
"2026-10-17 11:17:00-07:00",
"2026-10-17 11:12:00-07:00",
"2026-10-17 11:07:00-07:00",
"2026-10-17 11:02:00-07:00",
"2026-10-17 10:57:00-07:00"
],
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24.0,
25.0,
24.0,
25.0,
25.0,
28.0,
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136.0,
199.0,
189.0,
55.0
],
"StatusCode": "Complete"
},
{
"Id": "t5xx",
"Label": "targetgroup/prod-Targe-CSU397AXK7ZR/18376b322fd7b9c8 HTTPCode_Target_5XX_Count",
"Timestamps": [],
"Values": [],
"StatusCode": "Complete"
},
{
"Id": "healthy",
"Label": "targetgroup/prod-Targe-CSU397AXK7ZR/18376b322fd7b9c8 HealthyHostCount",
"Timestamps": [
"2026-10-17 11:52:00-07:00",
"2026-10-17 11:47:00-07:00",
"2026-10-17 11:42:00-07:00",
"2026-10-17 11:37:00-07:00",
"2026-10-17 11:32:00-07:00",
"2026-10-17 11:27:00-07:00",
"2026-10-17 11:22:00-07:00",
"2026-10-17 11:17:00-07:00",
"2026-10-17 11:12:00-07:00",
"2026-10-17 11:07:00-07:00",
"2026-10-17 11:02:00-07:00",
"2026-10-17 10:57:00-07:00"
],
"Values": [
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2.0,
2.0,
2.0,
2.0,
2.0,
2.0,
2.0,
2.0,
2.0,
2.0,
2.0
],
"StatusCode": "Complete"
},
{
"Id": "tmax",
"Label": "targetgroup/prod-Targe-CSU397AXK7ZR/18376b322fd7b9c8 TargetResponseTime",
"Timestamps": [
"2026-10-17 11:52:00-07:00",
"2026-10-17 11:47:00-07:00",
"2026-10-17 11:42:00-07:00",
"2026-10-17 11:37:00-07:00",
"2026-10-17 11:32:00-07:00",
"2026-10-17 11:27:00-07:00",
"2026-10-17 11:22:00-07:00",
"2026-10-17 11:17:00-07:00",
"2026-10-17 11:12:00-07:00",
"2026-10-17 11:07:00-07:00",
"2026-10-17 11:02:00-07:00",
"2026-10-17 10:57:00-07:00"
],
"Values": [
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0.112896,
0.101834,
0.075533,
31.63448,
10.694403,
6.1403,
10.163882,
6.893538,
6.221869
],
"StatusCode": "Complete"
},
{
"Id": "elb5xx",
"Label": "HTTPCode_ELB_5XX_Count",
"Timestamps": [],
"Values": [],
"StatusCode": "Complete"
}
],
"Messages": []
}
}E006 · aws
{
"id": "E006",
"source": "aws",
"collected_at": "2026-10-18T18:38:51.858759+00:00",
"error": false,
"arguments": {
"service": "elbv2",
"operation": "describe_target_health",
"parameters": {
"TargetGroupArn": "arn:aws:elasticloadbalancing:us-east-1:554812291621:targetgroup/prod-Targe-CSU397AXK7ZR/18376b322fd7b9c8"
}
},
"result": {
"TargetHealthDescriptions": [
{
"Target": {
"Id": "10.10.56.186",
"Port": 8081,
"AvailabilityZone": "us-east-1c"
},
"HealthCheckPort": "8081",
"TargetHealth": {
"State": "healthy"
},
"AdministrativeOverride": {
"State": "no_override",
"Reason": "AdministrativeOverride.NoOverride",
"Description": "No override is currently active on target"
}
},
{
"Target": {
"Id": "10.10.32.14",
"Port": 8081,
"AvailabilityZone": "us-east-1b"
},
"HealthCheckPort": "8081",
"TargetHealth": {
"State": "healthy"
},
"AdministrativeOverride": {
"State": "no_override",
"Reason": "AdministrativeOverride.NoOverride",
"Description": "No override is currently active on target"
}
}
]
}
}E007 · aws
{
"id": "E007",
"source": "aws",
"collected_at": "2026-10-18T18:38:52.119519+00:00",
"error": false,
"arguments": {
"service": "ecs",
"operation": "describe_clusters",
"parameters": {}
},
"result": {
"clusters": [],
"failures": [
{
"arn": "arn:aws:ecs:us-east-1:554812291621:cluster/default",
"reason": "MISSING"
}
]
}
}E008 · aws
{
"id": "E008",
"source": "aws",
"collected_at": "2026-10-18T18:38:52.481883+00:00",
"error": false,
"arguments": {
"service": "logs",
"operation": "describe_log_groups",
"parameters": {
"limit": 50
}
},
"result": {
"logGroups": [
{
"logGroupName": "/aws/chatbot/mermaid-dev-alerts",
"creationTime": 1780584695644,
"metricFilterCount": 0,
"arn": "arn:aws:logs:us-east-1:554812291621:log-group:/aws/chatbot/mermaid-dev-alerts:*",
"storedBytes": 1586,
"logGroupClass": "STANDARD",
"logGroupArn": "arn:aws:logs:us-east-1:554812291621:log-group:/aws/chatbot/mermaid-dev-alerts",
"deletionProtectionEnabled": false,
"bearerTokenAuthenticationEnabled": "[REDACTED]"
},
{
"logGroupName": "/aws/chatbot/mermaid-prod-alerts",
"creationTime": 1781961503675,
"metricFilterCount": 0,
"arn": "arn:aws:logs:us-east-1:554812291621:log-group:/aws/chatbot/mermaid-prod-alerts:*",
"storedBytes": 1081,
"logGroupClass": "STANDARD",
"logGroupArn": "arn:aws:logs:us-east-1:554812291621:log-group:/aws/chatbot/mermaid-prod-alerts",
"deletionProtectionEnabled": false,
"bearerTokenAuthenticationEnabled": "[REDACTED]"
},
{
"logGroupName": "/aws/ecs/containerinsights/mermaid-api-infra-common-EC2MermaidApiCluster980EA2CE-73Jj7DadNqlS/performance",
"creationTime": 1709232272303,
"retentionInDays": 1,
"metricFilterCount": 0,
"arn": "arn:aws:logs:us-east-1:554812291621:log-group:/aws/ecs/containerinsights/mermaid-api-infra-common-EC2MermaidApiCluster980EA2CE-73Jj7DadNqlS/performance:*",
"storedBytes": 19245905,
"logGroupClass": "STANDARD",
"logGroupArn": "arn:aws:logs:us-east-1:554812291621:log-group:/aws/ecs/containerinsights/mermaid-api-infra-common-EC2MermaidApiCluster980EA2CE-73Jj7DadNqlS/performance",
"deletionProtectionEnabled": false,
"bearerTokenAuthenticationEnabled": "[REDACTED]"
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}
}E009 · aws
{
"id": "E009",
"source": "aws",
"collected_at": "2026-10-18T18:38:52.875565+00:00",
"error": false,
"arguments": {
"service": "rds",
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},
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{
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},
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{
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],
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{
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},
{
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},
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},
{
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},
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}
]
},
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"LicenseModel": "postgresql-license",
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{
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}
],
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{
"Key": "aws:cloudformation:stack-name",
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},
{
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},
{
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]
}
}E010 · aws
{
"id": "E010",
"source": "aws",
"collected_at": "2026-10-18T18:38:53.130910+00:00",
"error": false,
"arguments": {
"service": "cloudwatch",
"operation": "describe_alarm_history",
"parameters": {
"AlarmName": "mermaid-prod-alb-p95-latency",
"HistoryItemType": "StateUpdate",
"MaxRecords": 20
}
},
"result": {
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{
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"Timestamp": "2026-10-17 11:28:08.153000-07:00",
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},
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}
]
}
}E011 · read_evidence
{
"id": "E011",
"source": "read_evidence",
"collected_at": "2026-10-18T18:39:06.249506+00:00",
"error": false,
"arguments": {
"evidence_id": "E008",
"start_char": 12000,
"chars": 6000
},
"result": {
"evidence_id": "E008",
"source": "aws",
"original_error": false,
"start_char": 12000,
"total_chars": 27582,
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}E012 · aws
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}E013 · aws
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}E014 · aws
{
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}E015 · aws
{
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},
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}E016 · aws
{
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}E017 · aws
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}E018 · aws
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}E019 · aws
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}E020 · aws
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