Evidence Map for Container Apps Troubleshooting¶

This page maps common investigation questions to the best evidence source, the CLI command to run, and the KQL table/query to use.

Use it when you know what you need to answer but not where to collect proof.

flowchart TD
    Q["Investigation Question"] --> SRC{"Best Evidence Source?"}
    SRC --> SYS["System Logs (ContainerAppSystemLogs_CL)"]
    SRC --> CON["Console Logs (ContainerAppConsoleLogs_CL)"]
    SRC --> ACT["Activity Log"]
    SRC --> CFG["App Configuration"]
    SYS --> CLI["az containerapp logs show --type system"]
    CON --> CLI2["az containerapp logs show --type console"]
    ACT --> CLI3["az monitor activity-log list"]
    CFG --> CLI4["az containerapp show"]

Why an evidence map¶

During incidents, teams lose time by checking the wrong signal first.

HTTP errors are checked in CPU charts
Startup issues are checked only in app code
DNS issues are diagnosed without network evidence

An evidence map reduces this by pairing each question with a reproducible command and query.

Use CLI and query artifacts for reproducible investigations

Since log result capture from the browser is awkward and difficult to maintain, use CLI queries and example outputs. This makes investigation reproducible, easier to copy, and easier to interpret.

Quick Map (Question → Source → Command → Table)¶

Question	Best Source	CLI Command	KQL Table
Was the revision restarting?	System logs + Activity Log	`az containerapp revision list --name $APP_NAME --resource-group $RG`	`ContainerAppSystemLogs_CL`
Was the app failing health probes?	System logs	`az containerapp logs show --name $APP_NAME --resource-group $RG --type system`	`ContainerAppSystemLogs_CL`
Was startup failing?	Console logs	`az containerapp logs show --name $APP_NAME --resource-group $RG --type console`	`ContainerAppConsoleLogs_CL`
Was an image pull failing?	System logs	`az containerapp logs show --name $APP_NAME --resource-group $RG --type system`	`ContainerAppSystemLogs_CL`
Was scaling not working?	System logs + Metrics	`az containerapp revision list --name $APP_NAME --resource-group $RG`	`ContainerAppSystemLogs_CL`
Was there a deployment?	Activity Log	`az monitor activity-log list --resource-group $RG --offset 24h`	Azure Activity Log
Was the container killed?	System logs	`az containerapp logs show --name $APP_NAME --resource-group $RG --type system`	`ContainerAppSystemLogs_CL`
Were there network errors?	Console logs	`az containerapp logs show --name $APP_NAME --resource-group $RG --type console`	`ContainerAppConsoleLogs_CL`
Was ingress configured correctly?	Container App config	`az containerapp show --name $APP_NAME --resource-group $RG --query "properties.configuration.ingress"`	N/A
Was managed identity failing?	Console + System logs	`az containerapp logs show --name $APP_NAME --resource-group $RG --type console`	`ContainerAppConsoleLogs_CL`
Was a secret missing?	System logs	`az containerapp logs show --name $APP_NAME --resource-group $RG --type system`	`ContainerAppSystemLogs_CL`
Was Dapr failing?	System logs	`az containerapp logs show --name $APP_NAME --resource-group $RG --type system`	`ContainerAppSystemLogs_CL`

Detailed Evidence Recipes¶

1) Was the revision restarting?¶

CLI¶

az containerapp revision list --name $APP_NAME --resource-group $RG --output table
az monitor activity-log list --resource-group $RG --offset 24h

KQL¶

ContainerAppSystemLogs_CL
| where TimeGenerated > ago(24h)
| where ContainerAppName_s == "<app-name>"
| where Reason_s has_any ("ContainerStarted", "ContainerTerminated", "ReplicaRestart")
| project TimeGenerated, RevisionName_s, Reason_s, Log_s
| order by TimeGenerated desc

2) Was the app failing health probes?¶

CLI¶

az containerapp logs show --name $APP_NAME --resource-group $RG --type system --tail 100

KQL¶

ContainerAppSystemLogs_CL
| where TimeGenerated > ago(6h)
| where ContainerAppName_s == "<app-name>"
| where Reason_s == "ProbeFailed"
| project TimeGenerated, RevisionName_s, Log_s
| order by TimeGenerated desc

3) Was startup failing?¶

CLI¶

az containerapp logs show --name $APP_NAME --resource-group $RG --type console --tail 100

KQL¶

ContainerAppConsoleLogs_CL
| where TimeGenerated > ago(6h)
| where ContainerAppName_s == "<app-name>"
| where Log_s has_any ("failed to start", "could not bind", "listen", "startup", "Exception", "Error")
| project TimeGenerated, RevisionName_s, Log_s
| order by TimeGenerated desc

4) Was an image pull failing?¶

CLI¶

az containerapp logs show --name $APP_NAME --resource-group $RG --type system --tail 100

KQL¶

ContainerAppSystemLogs_CL
| where TimeGenerated > ago(6h)
| where ContainerAppName_s == "<app-name>"
| where Reason_s has_any ("ImagePullBackOff", "ErrImagePull", "PullingImage", "PulledImage")
| project TimeGenerated, RevisionName_s, Reason_s, Log_s
| order by TimeGenerated desc

5) Was scaling not working?¶

CLI¶

az containerapp revision list --name $APP_NAME --resource-group $RG --output table
az containerapp show --name $APP_NAME --resource-group $RG --query "properties.template.scale"

KQL¶

ContainerAppSystemLogs_CL
| where TimeGenerated > ago(24h)
| where ContainerAppName_s == "<app-name>"
| where Reason_s has_any ("KEDAScaleTargetActivated", "KEDAScaleTargetDeactivated", "ScaledReplica")
| project TimeGenerated, RevisionName_s, Reason_s, Log_s
| order by TimeGenerated asc

6) Was there a deployment?¶

CLI¶

az monitor activity-log list --resource-group $RG --offset 24h --status Succeeded
az containerapp revision list --name $APP_NAME --resource-group $RG --output table

KQL¶

ContainerAppSystemLogs_CL
| where TimeGenerated > ago(24h)
| where ContainerAppName_s == "<app-name>"
| where Reason_s has_any ("RevisionCreated", "ContainerCreated", "PulledImage")
| project TimeGenerated, RevisionName_s, Reason_s, Log_s
| order by TimeGenerated desc

7) Was the container killed?¶

CLI¶

az containerapp logs show --name $APP_NAME --resource-group $RG --type system --tail 100

KQL¶

ContainerAppSystemLogs_CL
| where TimeGenerated > ago(24h)
| where ContainerAppName_s == "<app-name>"
| where Reason_s == "ContainerTerminated"
| where Log_s has_any ("OOMKilled", "exit code", "killed", "terminated")
| project TimeGenerated, RevisionName_s, Log_s
| order by TimeGenerated desc

8) Were there network errors?¶

CLI¶

az containerapp logs show --name $APP_NAME --resource-group $RG --type console --tail 100

KQL¶

ContainerAppConsoleLogs_CL
| where TimeGenerated > ago(6h)
| where ContainerAppName_s == "<app-name>"
| where Log_s has_any ("connection refused", "connection reset", "timeout", "DNS", "ECONNRESET", "ETIMEDOUT")
| project TimeGenerated, Log_s
| order by TimeGenerated desc

9) Was ingress configured correctly?¶

CLI¶

az containerapp show --name $APP_NAME --resource-group $RG --query "properties.configuration.ingress" --output json
az containerapp show --name $APP_NAME --resource-group $RG --query "properties.configuration.ingress.fqdn" --output tsv

KQL¶

ContainerAppSystemLogs_CL
| where TimeGenerated > ago(6h)
| where ContainerAppName_s == "<app-name>"
| where Log_s has_any ("ingress", "routing", "target port", "external")
| project TimeGenerated, Reason_s, Log_s
| order by TimeGenerated desc

10) Was managed identity failing?¶

CLI¶

az containerapp logs show --name $APP_NAME --resource-group $RG --type console --tail 100
az containerapp identity show --name $APP_NAME --resource-group $RG

KQL¶

ContainerAppConsoleLogs_CL
| where TimeGenerated > ago(6h)
| where ContainerAppName_s == "<app-name>"
| where Log_s has_any ("managed identity", "DefaultAzureCredential", "ManagedIdentityCredential", "token", "unauthorized", "403")
| project TimeGenerated, Log_s
| order by TimeGenerated desc

11) Was a secret missing?¶

CLI¶

az containerapp logs show --name $APP_NAME --resource-group $RG --type system --tail 100
az containerapp secret list --name $APP_NAME --resource-group $RG --output table

KQL¶

ContainerAppSystemLogs_CL
| where TimeGenerated > ago(6h)
| where ContainerAppName_s == "<app-name>"
| where Log_s has_any ("secret", "key vault", "SecretNotFound", "reference")
| project TimeGenerated, Reason_s, Log_s
| order by TimeGenerated desc

12) Was Dapr failing?¶

CLI¶

az containerapp logs show --name $APP_NAME --resource-group $RG --type system --tail 100
az containerapp dapr show --name $APP_NAME --resource-group $RG

KQL¶

ContainerAppSystemLogs_CL
| where TimeGenerated > ago(6h)
| where ContainerAppName_s == "<app-name>"
| where Log_s has_any ("dapr", "sidecar", "component", "state store", "pubsub")
| project TimeGenerated, Reason_s, Log_s
| order by TimeGenerated desc

Evidence Quality Checklist¶

Keep all evidence in one incident time window.
Correlate system, console, and activity log signals before selecting a root cause.
Preserve query text used during the incident for post-incident review.
Capture command outputs in ticket notes with sensitive identifiers removed.

Evidence Map for Container Apps Troubleshooting¶

Why an evidence map¶

Quick Map (Question → Source → Command → Table)¶

Detailed Evidence Recipes¶

1) Was the revision restarting?¶

CLI¶

KQL¶

2) Was the app failing health probes?¶

CLI¶

KQL¶

3) Was startup failing?¶

CLI¶

KQL¶

4) Was an image pull failing?¶

CLI¶

KQL¶

5) Was scaling not working?¶

CLI¶

KQL¶

6) Was there a deployment?¶

CLI¶

KQL¶

7) Was the container killed?¶

CLI¶

KQL¶

8) Were there network errors?¶

CLI¶

KQL¶

9) Was ingress configured correctly?¶

CLI¶

KQL¶

10) Was managed identity failing?¶

CLI¶

KQL¶

11) Was a secret missing?¶

CLI¶

KQL¶

12) Was Dapr failing?¶

CLI¶

KQL¶

Evidence Quality Checklist¶

See Also¶

Sources¶