API details: Identify slow and failing API calls - Application Real-Time Monitoring Service

The API Details page in ARMS Browser Monitoring surfaces success rates, response times (RT), and error counts for API calls in your web application. Use this page to spot slow endpoints (RT > 1,000 ms), trace failing requests back to specific status codes or return messages, and break down traffic by geography, domain, device, and other dimensions.

Quick troubleshooting reference

Symptom	Where to look
Overall success rate is dropping	API Request Statistics > Success Rate tab
High response times	API Request Statistics > Success RT or Failure RT tab
Spike in slow responses	API Request Statistics > Slow Responses tab
Increase in errors	API Request Statistics > Error Number tab
Specific endpoint is failing	API Requests tab > click the number in the Error Number column
Slow responses on a specific endpoint	API Requests tab > click the number in the Slow Responses column
Errors from a specific status code	HTTP Status Code tab > Set To Search Value on the target code
Traffic breakdown by geography or device	Distribution tab

Open the API details page

Log on to the ARMS console.
In the left-side navigation pane, choose Browser Monitoring > Browser Monitoring.
On the Browser Monitoring page, click the name of the application.
In the left-side navigation pane, choose Application > API Details.

The page is divided into three sections:

Section	Description
Filters (top)	Narrow results by specific dimensions.
API Request Statistics (middle)	View trends for success rate, RT, slow responses, and errors over time.
Detail tabs (bottom)	Explore individual API endpoints, responses, HTTP status codes, and distribution breakdowns.

Filters

Filter data by one or more dimensions: API, Return Message, HTTP Status Code, Page, Geography, OS, Domain Name, Connection Type, Device, Browser, UID, and Username.

To remove a single filter, hover over it and click the icon.
To clear all filters, click Reset.

API request statistics

The API Request Statistics section provides time-series charts across five tabs. Hover over any chart to view exact values at a specific point in time.

Success rate

Click the Success Rate tab to view the success rate trend alongside request and error volumes.

Chart element	Description
Success Rate (line)	Percentage of successful API calls over time. Corresponds to the right y-axis.
Successful Requests (blue bars)	Number of successful API calls per hour. Corresponds to the left y-axis.
Error Number (yellow bars)	Number of failed API calls per hour. Corresponds to the left y-axis.

Hover over the chart to view the success rate, number of successful requests, number of failed requests, and number of users that encounter failures at a specific point in time.

Response time

Click the Success RT or Failure RT tab to compare RT trends against the 1,000 ms threshold.

Chart element	Description
Success Avg RT / Failure Avg RT (line)	Average RT for successful or failed API calls over time. Corresponds to the right y-axis.
Calls <= 1000ms (blue bars)	Number of calls with RT at or below 1,000 ms per hour. Corresponds to the left y-axis.
Calls > 1000ms (yellow bars)	Number of calls with RT above 1,000 ms per hour. Corresponds to the left y-axis.

Slow responses

Note Slow responses are API calls with an RT greater than 1,000 ms.

Click the Slow Responses tab to view the volume of slow responses over time.

Chart element	Description
Slow Responses (bars)	Number of slow responses per hour. Corresponds to the left y-axis.

Error count

Click the Error Number tab to view the volume of failed API calls over time.

Chart element	Description
Error Number (bars)	Number of failed API calls per hour. Corresponds to the left y-axis.

Detail tabs

The bottom section contains four tabs for drilling into individual endpoints: API Requests, Responses, HTTP Status Code, and Distribution.

Common actions across tabs

The API Requests, Responses, and HTTP Status Code tabs share the following actions:

Action	How to
Sort the list	Click the icon next to any column header.
Add a filter	Hover over a value in the key column (API name, return message, or HTTP status code) and click Set To Search Value.
View slow-response details	Click a number in the Slow Responses column. In the Request Details panel, click Show Invocation Trace to view call traces and business traces, or click View Session to view session traces.
Open the analyze view	Click Analyze in the Operation column. See the Analyze sub-tabs section below for details.

API Requests

Click the API Requests tab to view per-endpoint metrics for all API calls within the selected time range.

In addition to the common actions, this tab supports:

View error details: Click a number in the Error Number column to view the details and distribution of failed API calls. In the Request Details panel, click Show Invocation Trace to view call traces and business traces, or click View Session to view session traces.
Edit alias: Hover over an API name in the API column and click the icon to modify its alias. The alias is used as the display name across the page.

Responses

Click the Responses tab to view metrics grouped by return message.

This tab uses the same common actions described above. Hover over a value in the Return Message column and click Set To Search Value to filter by that response.

HTTP status code

Click the HTTP Status Code tab to view metrics grouped by HTTP status code.

This tab uses the same common actions described above. Hover over a value in the HTTP Status Code column and click Set To Search Value to filter by that status code.

Distribution

Click the Distribution tab to view how API calls break down across multiple dimensions: return messages, HTTP status codes, pages, domain names, and geographical locations. Pie charts show the proportions by operating system, browser, device, and connection type.

Hover over a value in the Domain Name or Page column and click Set To Search Value to add it as a filter.
Pie charts display only the first five items. Click the Toggle View icon in the upper-right corner of each chart to view all items.

Note Version numbers are displayed only for operating system and browser breakdowns.

Analyze sub-tabs

When you click Analyze on any row in the API Requests, Responses, or HTTP Status Code tab, a detail view opens with four sub-tabs:

Sub-tab	What it shows
API Details	Success rate trend and per-request details. In the Request Details section, click Show Invocation Trace to view call traces and business traces, or click View Session to view session traces.
API Error Details	Failed API call details and the distribution of errors.
API Slow Loading Details	RT distribution and network request information for slow calls.
Distribution	Breakdown by return message, HTTP status code, page, domain name, geographical location, operating system, browser, device, and connection type.