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Queries for the ApiManagementGatewayLogs table

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For information on using these queries in the Azure portal, see Log Analytics tutorial. For the REST API, see Query.

Number of requests

Count the total number of calls across all APIs in the last 24 hours.

//Total number of call per resource
ApiManagementGatewayLogs
| where TimeGenerated > ago(1d)
| summarize count(CorrelationId) by _ResourceId

Logs of the last 100 calls

Get the logs of the most recent 100 calls in the last 24 hours.

ApiManagementGatewayLogs
| top 100 by TimeGenerated desc

Number of calls by APIs

View the number of calls per API in the last 24 hours.

//Calls by API ID
ApiManagementGatewayLogs
| where TimeGenerated > ago(1d)
| summarize count(CorrelationId) by ApiId

Bandwidth consumed

Total bandwidth consumed in the last 24 hours.

// To create an alert for this query, click '+ New alert rule'
ApiManagementGatewayLogs
| where TimeGenerated > ago(1d)
| extend bandwidth = RequestSize + ResponseSize 
| summarize sum(bandwidth) by bin(TimeGenerated, 15m), _ResourceId 
| render timechart

Request sizes

Statistics of request sizes in the last 24 hours.

// To create an alert for this query, click '+ New alert rule'
ApiManagementGatewayLogs
| where TimeGenerated > ago(1d)
| summarize Average=avg(RequestSize), Median=percentile(RequestSize, 50), 90th_Percentile=percentile(RequestSize, 90) by bin(TimeGenerated, 5m) 
| render timechart

Response sizes

Statistics of response sizes in the last 24 hours.

// To create an alert for this query, click '+ New alert rule'
ApiManagementGatewayLogs
| where TimeGenerated > ago(1d)
| summarize Average=avg(ResponseSize), Median=percentile(ResponseSize, 50), 90th_Percentile=percentile(ResponseSize, 90) by bin(TimeGenerated, 5m) 
| render timechart

Client TLS versions

Breakdown of client TLS versions in the last 24 hours.

ApiManagementGatewayLogs
| where TimeGenerated > ago(1d)
| summarize count(CorrelationId) by ClientTlsVersion, _ResourceId

Error reasons breakdown

Breakdown of all error reasons in the last 24 hours.

// To create an alert for this query, click '+ New alert rule'
ApiManagementGatewayLogs
| where TimeGenerated > ago(1d)
| where IsRequestSuccess == false
| summarize count(CorrelationId) by LastErrorReason, _ResourceId

Last 100 failed requests

Get the logs of the last 100 failed requests.

ApiManagementGatewayLogs
| where TimeGenerated > ago(1d)
| where IsRequestSuccess == false
| top 100 by TimeGenerated desc| where ResponseCode >= 400

Get the logs of failed requests due to backend issues.

// To create an alert for this query, click '+ New alert rule'
ApiManagementGatewayLogs
| where TimeGenerated > ago(1d)
| where IsRequestSuccess == false
| where BackendResponseCode >= 400

Get the logs of failed requests due to issues not related to the backend (e.g., API Mangement policies configuration, rate limit exceeded, client disconnection).

// To create an alert for this query, click '+ New alert rule'
ApiManagementGatewayLogs
| where TimeGenerated > ago(1d)
| where IsRequestSuccess == false
| where isnull(BackendResponseCode) or BackendResponseCode < 400
| where ResponseCode >= 400

Overall latency

Statistics of overall latency (in miliseconds) between the time API Mangement starts receiving a request and the time API Management finishes sending the response back to the client.

// To create an alert for this query, click '+ New alert rule'
ApiManagementGatewayLogs
| where TimeGenerated > ago(1d)
| summarize Average=avg(TotalTime), Median=percentile(TotalTime, 50), 90th_Percentile=percentile(TotalTime, 90) by bin(TimeGenerated, 15m) 
| render timechart

Backend latency

Statistics of time (in miliseconds) spent in backend IO.

// To create an alert for this query, click '+ New alert rule'
ApiManagementGatewayLogs
| where TimeGenerated > ago(1d)
| summarize Average=avg(BackendTime), Median=percentile(BackendTime, 50), 90th_Percentile=percentile(BackendTime, 90) by bin(TimeGenerated, 15m) 
| render timechart

Client latency

Statistics of time (in miliseconds) spent in client IO.

// To create an alert for this query, click '+ New alert rule'
ApiManagementGatewayLogs
| where TimeGenerated > ago(1d)
| summarize Average=avg(ClientTime), Median=percentile(ClientTime, 50), 90th_Percentile=percentile(ClientTime, 90) by bin(TimeGenerated, 15m) 
| render timechart

Cache hit ratio

Statistics of Cache hit/miss ratio.

// To create an alert for this query, click '+ New alert rule'
ApiManagementGatewayLogs
| where TimeGenerated > ago(1d)
| summarize Cache_Miss=countif(Cache  == "miss"), Cache_Hit=countif(Cache == "hit") by bin(TimeGenerated, 15m)
| extend Ratio=Cache_Hit / (Cache_Hit + Cache_Miss)
| project-away Cache_Hit , Cache_Miss 
| render timechart