Manual Chapter : HTTP Application service alerts

Applies To:

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BIG-IQ Centralized Management

  • 8.2.0, 8.1.0, 8.0.0
Manual Chapter

HTTP Application service alerts

HTTP application service alerts notify regarding changes in metrics that can affect the overall performance of traffic or security management for your managed application. When one or more of these thresholds are crossed, the health of your HTTP application service will change. You can view alerts from the single application service's screen (
Applications
APPLICATIONS
<Application Name>
<HTTP application service>
), or the alerts screens (
Applications
ALERT MANAGEMENT
Active Alerts
or
Alert History
).
The following chart outlines the metric conditions for monitoring HTTP application services.
*Indicates that this data was collected from TCP traffic information, and indicates network latency and transmission times. Mitigation may require changes to your TCP profile.
**The Additional Data column refers to the ANALYTICS portion of the single application service's screen. The charts sited are located when either
APPLICATION SERVICE
or
Traffic Management
services are selected, unless stated otherwise (see image for reference).
Metric Conditions
Alert
Description
Impact
Default Thresholds
Additional Data**
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.
No default
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 > 50ms
Warning > 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.
No default
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.
No default
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.
No default
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.
No default
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.
No default
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.
No default
Server Side Throughput In*
The average volume (in Mbps) of traffic sent from BIG-IP to the server.
No default
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.
No default
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.
No default
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.
No default
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