HTTP Application service alerts

Application Response Time

The average time from when the server receives the request from the BIG-IP system until the server sends the response. This metric is a reflection of the server’s activities, as it deducts network latency and transmission time.

Increased server response latency can negatively impact the user’s experience in accessing the application’s contents.

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Select the Application Response Time chart from the menu to the bottom left. Use the dimensions to the right of the chart to identify if the issue is found on specific virtual servers or pool members.

Server Side RTT*

The average round trip time (RTT) for network communication between the BIG-IP system and the application server.

Increased latency over time can indicate a variety of issues including: server defects, bandwidth outage, or BIG-IP device issues.

Critical > 50msWarning > 20ms

Cleared < 20ms

Select the Server Side RTT or Client Side RTT chart from the menu to the bottom left. Use the dimensions to the right of the chart to identify if the issue is found on specific BIG-IP devices or virtual servers.

Client Side RTT*

The average round trip time (RTT) for network communication between the BIG-IP system and the client application request.

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Incomplete Transactions

The percent of transactions, out of all transactions, that did not complete the request and response exchange.

A higher percentage of unresolved transactions can indicate a number of issues that negatively impact a user’s connection. Increased incomplete transactions can result from a query timeout, or an unknown cancellation.

Critical > 5%Warning > 1%

Cleared < 1%

Select the Transactions chart from the menu to the bottom left. Use the dimensions to the right of the chart to identify if the issue is found on specific BIG-IP devices or virtual servers.

Request Errors

The average rate of transactions that returned a request error response code (4XX) out of all the overall transactions.

Increased 4XX errors indicate issues with client-side access, with broken links as the most common error.

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Select the Response Codes chart from the menu to the bottom left. Use the dimensions to the right chart to filter specific response codes and URLs.

Server Errors

The average rate of transactions that returned a server error response code (5XX) out of all the overall transactions.

Increased 5XX errors indicate issues with the application server.

Critical > 0.05%Warning > 0.01%

Cleared < 0.01%

Select the Response Codes chart from the menu to the bottom left. Use the dimensions to the right chart to filter specific response codes and pool members.

High TPS

The number of server transactions per second (TPS) is higher than the expected average.

The rate of application activity is higher than expected and may limit the application server’s resources. This may also indicate an attack.

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Select SERVER services to view top pool member charts. Select the TPS chart and use the dimensions to the right of the chart to filter specific virtual servers and pool members.

Low TPS

The number of server transactions per second (TPS) is lower than the expected average.

The rate of application activity is lower than expected. This may indicate that your application servers resources are limited.

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Client Side Throughput In*

The average volume (in Mbps) of traffic sent from BIG-IP to the client.

Sudden increases in traffic volume can lead to a variety of issues that can affect the application’s performance. When throughput exceeds a certain value you can inspect for: server defects, bandwidth outage, DoS attack signatures or BIG-IP device resource limitations.

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Select CLIENT services to view client side transaction charts. Select the Client Side Throughput and use the dimensions to the right of the chart to filter specific BIG-IP devices or virtual servers.

Client Side Throughput Out*

The average volume (in Mbps) of traffic sent from the client to BIG-IP.

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Server Side Throughput In*

The average volume (in Mbps) of traffic sent from BIG-IP to the server.

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Select SERVER services to view top pool member charts. Select the Server Side Throughput and use the dimensions to the right of the chart to filter specific virtual servers and pool members.

Server Side Throughput Out*

The average volume (in Mbps) of traffic sent from the server to BIG-IP.

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Client Side Goodput Received*

The volume (in Mbps) of useful, uncorrupted packets received by the client from BIG-IP is lower than expected.

Lowered goodput indicates suboptimal flow control and congestion avoidance over the transport layer. A lower ratio of goodput to maximum throughput can indicate a number of issues with the network including, an increase in TCP slow start or congestion control, packet loss and network interference.

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Select CLIENT services to view client side transaction charts. Select the Client Side Goodput chart, and use the dimensions to the right of the chart to filter specific virtual servers and BIG-IP devices.

Client Side Goodput Sent*

The volume (in Mbps) of useful, uncorrupted packets sent from the client to BIG-IP is lower than expected.

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Server Side Goodput Received*

The volume (in Mbps) of useful, uncorrupted packets received by the server from BIG-IP is lower than expected.

No default

Select SERVER services to view top pool member charts. Select the Server Side Goodput chart, and use the dimensions to the right of the chart to filter specific virtual servers and pool members.

Server Side Goodput Sent*

The volume (in Mbps) of useful, uncorrupted packets sent from the server to BIG-IP is lower than expected.

No default