Managing Function Logs

Using AOM to Manage Function Logs

1. Log in to the FunctionGraph console. In the navigation pane, choose Functions > Function List.
2. Click the name of the desired function.
3. Choose Monitoring > Logs. On the displayed page, enter search criteria.
   

   • You can:

     1. Enter a keyword for exact search. A keyword is a word between two adjacent delimiters.

     2. Enter a keyword with wildcards for fuzzy match. Example: *ROR*, ERR*, or ER*OR.

     3. Enter a phrase for exact search. Example: Start to refresh alm Statistic.

     4. Use AND (&&) or OR (||) to combine keywords to search. Example: query&&logs or query||logs.

   • You can select Last 30 minutes, Last hour, Last day, and Custom (up to one month, for example, 2022/04/01 16:34:48–2022/05/01 16:34:48).
   • You can query logs by version.

4. Click to search for logs.
   Figure 2 Querying logs
   
   

   The log query result contains time, request ID, invocation result, duration, memory, and version.

5. Perform the following operations if needed:

   1. Search for logs by keyword.

   2. Filter logs by status: Error, Info, Error & Warning, and Error & Warning & Info.

   3. View logs in full screen.

   4. Download logs.

   Figure 3 Other operations
   

Using LTS to Manage Function Logs

You can enable LTS to better manage function logs. After you enable LTS, FunctionGraph automatically creates a log group starting with functiongraph. When you create a function, a log stream starting with the function name is generated.

You can also bind a log group and log stream to a function to store its invocation logs. For details, see Configuring a Log Group and Log Stream.

• By default, 20 log streams are created, which cannot be customized. On the Logs tab page of the function, press F12 to find out the log stream ID of the query API, and then locate the corresponding log stream ID in LTS.

  

• Deleting a function log group by mistake on the LTS console will not be detected by FunctionGraph, and the historical log data can no longer be retrieved. To use a log group, modify the function description and save the changes. A new log group will be created.

1. Enable LTS.

   Enabling LTS in FunctionGraph v1: On the Logs tab page, click Enable LTS to Manage Function Logs.

   Figure 4 Enabling LTS to manage function logs
   
   

   In FunctionGraph v1, you can switch back to AOM. In that case, AOM will take over LTS to manage function logs. You will be billed for logs generated on a pay-per-use basis.

   Enabling LTS in FunctionGraph v2: On the Logs tab page, click Enable LTS. Click OK. LTS is enabled successfully.

   Figure 5 Enabling LTS to manage function logs
   
   

   In FunctionGraph v2, only LTS can be used to manage function logs.

2. Set filter criteria.
   • Request List: Filter requests by request ID, result (success or failure), or cause (initialization failed, load failed, system error, timed out, out of memory, out of disk space, or code error).
   • Request Log: Filter logs by keyword, request ID, or instance ID.

   Table 1 Invocation result

   Result	Description
   Execution successful	Log printed when a function is successfully executed.
   Execution failed	Log printed when a function fails to be executed due to invocation timeout, memory or disk threshold exceeded, or code errors. To view the logs about invocation timeout, select Invocation timed out from the drop-down list. The methods for viewing the other three types of logs are the same.

   Table 2 Cause analysis

   Cause	Description
   Initialization failed	Log printed when the function initialization fails.
   Load failed	Log generated when the runtime fails to load your function file.
   System error	Internal error.
   Invocation timed out	Log printed when the function invocation period is longer than the preset limit.
   Memory threshold exceeded	Log printed when the function memory size exceeds the preset limit.
   Disk threshold exceeded	Log printed when the disk size exceeds the preset limit.
   Code error	Log printed when a code error occurs.

   

   • You can view logs of the last hour, last day, last 3 days, or a custom time period.
   • To manage function logs, go to the LTS console.
   • Max. 10 MB logs can be retained for common instances during initialization. When this limit is reached, the latest logs replace the old ones.

Downloading Logs

• Currently, logs can be downloaded only when you use AOM for log management.
• FunctionGraph v1 allows you to manage function logs using AOM.
• FunctionGraph v2 allows you to manage function logs using LTS, but does not support log download.

1. Return to the FunctionGraph console, and choose Functions > Function List in the navigation pane.
2. Click the name of the desired function.
3. Click Monitoring.
4. On the Logs page, 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 log loss.