Data available on connection to a running application

When connecting the Health Center to a running application, the data available for the client to display can vary for a number of reasons.

The data available to the Health Center client on connection to a live source varies depending on the following conditions:

  • If this is the first Health Center client that has connected to a particular live source since it was started.
  • The type of runtime environment, for example Java™ or Node.js.
  • The version of the Java Virtual Machine (JVM) or Node.js runtime engine that is being monitored.
  • The version of the monitoring agent used (see the section on platform requirements for the agent in: Platform requirements).
Health Center clients consume data from the system to which they are connected. Therefore, after the first time that a Health Center client connects to a particular live source, subsequent Health Center client connections to the same source will not have access to data used by the first Health Center client connection.
For example:
  1. Health Center client A connects to live source L.
  2. Health Center client A uses some data from live source L and then disconnects.
  3. Health Center client B connects to live source L.
When Health Center client B connects, the data that was used by client A is no longer available, so client B can access only the data that client A did not use.

Data available on first Health Center client connections to a live source

Runtime environment version Available data
  • IBM® SDK for Node.js, Version 1.1.0.10 and later
  • IBM SDK, Java Technology Edition, Version 5 service refresh 10 and later
  • IBM SDK, Java Technology Edition, Version 6 service refresh 5 and later
As much historical data as fits in the monitoring agent's buffer, up to the current time.
  • IBM SDK, Java Technology Edition, Version 5 service refresh 9 and earlier
  • IBM SDK, Java Technology Edition, Version 6 service refresh 4 and earlier
Data from the time when the live source was started until the current time.

Data available on subsequent Health Center client connection to a live source

Runtime environment version Available data
  • IBM SDK for Node.js, Version 1.1.0.10 and later
  • IBM SDK, Java Technology Edition, Version 5 service refresh 10 and later
  • IBM SDK, Java Technology Edition, Version 6 service refresh 5 and later
As much historical data as fits in the monitoring agent's buffer, up to the current time, which has not already been used by a Health Center client.
Note: In the profiling perspective, some method names might not display immediately.
  • IBM SDK, Java Technology Edition, Version 5 service refresh 9 and earlier
  • IBM SDK, Java Technology Edition, Version 6 service refresh 4 and earlier
All data from the time when the live source was started until the current time, which has not already been used by a Health Center client.
Restriction: Method names are available only for classes loaded since the previous Health Center client was disconnected.




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