Function Monitoring

After creating a function and trigger, you can monitor the real-time invocation and running statuses of the function.

Viewing Function Metrics

FunctionGraph differentiates the metrics of a function by version, allowing you to query the metrics of a specific function version.

Procedure

Log in to the FunctionGraph console, and choose Functions > Function List in the navigation pane.
Click the name of the desired function.
Choose Monitoring > Metrics, select an interval (5 minutes, 15 minutes, or 1 hour), and check the running status of the function.

The following metrics are displayed: invocations, errors, duration (maximum, average, and minimum durations), throttles, and instance statistics.

Function metrics

Table 1 describes the function metrics.

**Table 1** Function metrics
Metric	Unit	Description
Invocations	Count	Total number of invocation requests, including invocation errors and throttled invocations. In asynchronous invocation mode, the count starts only when a function is executed in response to a request.
Duration	ms	Maximum Duration: the maximum duration a function is executed within a period. Minimum Duration: the minimum duration a function is executed within a period. Average Duration: the average duration a function is executed within a period.
Errors	Count	Number of times that your functions failed with error code 200 being returned. Errors caused by function syntax or execution are also included.
Throttles	Count	Number of times that FunctionGraph throttles your functions due to the resource limit.
Instance Statistics	N/A	Numbers of concurrent requests and reserved instances.

Viewing Monitoring Graphs

Create an alarm rule for a function to report metrics to Cloud Eye so that you can view monitoring graphs and alarm messages on the Cloud Eye console.

Log in to the FunctionGraph console, and choose Functions > Function List in the navigation pane.
Click the name of the desired function.
On the displayed function details page, select a function version or alias, and choose Monitoring > Metrics.
Click Create Alarm Rule.
In the Create Alarm Rule dialog box, set alarm parameters and click Next.
Enter a rule name and click OK.

Function Metrics

Table 2 lists the function metrics that can be monitored by Cloud Eye.

**Table 2** Function metrics
Metric	Display Name	Description	Unit	Upper Limit	Recommended Threshold	Value Type	Dimension
count	Invocations	Number of function invocations	Count	-	-	int	package-functionname
failcount	Errors	Number of invocation errors	Count	-	-	int	package-functionname
rejectcount	Throttles	Number of function throttles	Count	-	-	int	package-functionname
duration	Average Duration	Average duration of function invocation	ms	-	-	int	package-functionname
maxDuration	Maximum Duration	Maximum duration of function invocation	ms	-	-	int	package-functionname
minDuration	Minimum Duration	Minimum duration of function invocation	ms	-	-	int	package-functionname
concurrency	Concurrency	The number of requests that can be processed concurrently	N/A	-	-	int	package-functionname
payPerUseInstance	Elastic Instances	Number of instances actually used by a function after reserved instances are excluded	N/A	-	-	int	package-functionname
failRate	Error Rate	Percentage of errors to the total invocations of a function	%	-	-	float	package-functionname
functionErrorCount	Function Error Count	Number of function errors that occur during invocation	Count	-	-	float	package-functionname
memoryUsed	Memory	Memory used by the function	MB	-	-	float	package-functionname
duration_p500	Duration (P50)	P50 execution duration of the function	ms	-	-	float	package-functionname
duration_p800	Duration (P80)	P80 execution duration of the function	ms	-	-	float	package-functionname
duration_p950	Duration (P95)	P95 execution duration of the function	ms	-	-	float	package-functionname
duration_p990	Duration (P990)	P990 execution duration of the function	ms	-	-	float	package-functionname
duration_p999	Duration (P999)	P999 execution duration of the function	ms	-	-	float	package-functionname
instances	Instances	Number of reserved instances for function invocation.	N/A	-	-	int	package-functionname
systemErrorCount	System Errors	Number of system errors that occur during function invocation	Count	-	-	int	package-functionname
reservedinstancenum	Reserved Instances	Number of reserved instances	N/A	-	-	int	package-functionname
functionCost	Resource Usage	Resources used by the function (Memory x Duration)	MB	-	-	float	package-functionname

Querying Logs

After querying the logs of a function version within a specified date range, you can download the logs for further analysis.

Log in to the FunctionGraph console, and choose Functions > Function List in the navigation pane.
Click the name of the desired function.
Select the version or alias of the function, and choose Monitoring > Logs > Request Logs.
Set the search criteria.

Downloading Logs

Log in to the FunctionGraph console, and choose Functions > Function List in the navigation pane.
Click the name of the desired function.
Choose Monitoring > Logs > Request Logs.
Select a version and time range, and click Download Log.

A maximum of 5000 logs can be downloaded at a time. When querying logs, select a proper time range to avoid the loss of logs.