Use of FunctionGraph

FunctionGraph allows you to run your code without provisioning or managing servers, while ensuring high availability and scalability. All you need to do is upload your code and set execution conditions, and FunctionGraph will take care of the rest. You pay only for what you use and you are not charged when your code is not running.

To quickly create a function using FunctionGraph, do as follows:

Set permissions: Ensure that you have the FunctionGraph Administrator permissions.
Create a function: Create a function from scratch or using the sample code or a container image.
Configure the function: Configure the code source or modify other parameters.
Test the function: Create a test event to debug the function.
View the execution result: On the function details page, view the execution result based on the configured test event.
View metrics: On the Monitoring tab page of the function details page, view function metrics.

Process

Figure 1 shows the process of using functions.

Write code, package and upload it to FunctionGraph, and add event sources such as Simple Message Notification (SMN) and API Gateway (APIG) event sources to build applications.
Functions are triggered by RESTful API calls or event sources to achieve expected service purposes. During this process, FunctionGraph automatically schedules resources.
View logs and metrics. Note that you will be billed based on code execution duration.
Figure 1 Flowchart

The following shows the details:

Write code.
Write code in Node.js, Python, Java, C#, PHP, or Go. For details, see the FunctionGraph Developer Guide.
Upload code.
Edit code inline, upload a local ZIP or JAR file, or upload a ZIP file from OBS. For details, see Creating a Deployment Package.
Trigger functions by API calls or cloud service events.
Functions are triggered by API calls or cloud service events. For details, see Creating Triggers.
Implement auto scaling.
FunctionGraph implements auto scaling based on the number of requests. For details, see Notes and Constraints.
View logs.
View run logs of function. FunctionGraph is interconnected with Log Tank Service (LTS). For details, see Logs.
View monitoring information.
View graphical monitoring information. FunctionGraph is interconnected with Cloud Eye. For details, see Metrics.
Check your bills.
After function execution is complete, you will be billed based on the number of function execution requests and execution duration.

Introduction to Dashboard

View your created functions/function quota, used storage/storage quota, and monthly invocations and resource usage.
Figure 2 Monthly statistics

View tenant-level metrics, including invocations, top 10 functions by invocation, errors, top 10 functions by error, duration, and throttles.

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 case of asynchronous invocation, the count starts only when a function is executed in response to a request.
The 10 Functions with the Most Invocations	-	Top 10 functions by invocation in the last day, last 3 days, or a custom period.
Duration	ms	Maximum duration: the maximum duration all functions are executed at a time within a period. Minimum duration: the minimum duration all functions are executed at a time within a period. Average duration: the average duration all functions are executed at a time 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.
The 10 Functions with the Most Errors	-	Top 10 functions by error in the last day, last 3 days, or a custom period.
Throttles	Count	Number of times that FunctionGraph throttles your functions due to the resource limit.

View flow metrics, including the number of invocations, duration, number of errors, and number of running workflows.

Metric	Unit	Description
Invocations	Count	Total number of invocation requests, including successful, failed, and ongoing requests. In case of asynchronous invocation, the count starts only when a flow executes in response to a request.
Duration	ms	Average time taken to execute a flow in a specified period.
Errors	Count	Number of times that flows failed to be executed.
Running Workflows	Count	Number of ongoing flow executions.