apm: remove TBS high RSS common problem (#1268)

Removing APM Server TBS high RSS common problem as it was resolved in
8.14.2. Moreover, in 9.0, TBS consumes even less memory and disk IO
thanks to a new storage layer.

Author: carsonip

troubleshoot/observability/apm/common-problems.md

@@ -18,7 +18,6 @@ This section describes common problems you might encounter when using APM Server
 * [Common SSL-related problems](#apm-common-ssl-problems)
 * [I/O Timeout](#apm-io-timeout)
 * [Field limit exceeded](#apm-field-limit-exceeded)
-* [Tail-based sampling causing high system memory usage and high disk IO](#apm-tail-based-sampling-memory-disk-io)
 
 **Applications UI**:
 
@@ -180,14 +179,6 @@ In the agent logs, you won’t see a sign of failures as the APM server asynchro
 ```
 
 
-## Tail-based sampling causing high system memory usage and high disk IO [apm-tail-based-sampling-memory-disk-io]
-```yaml {applies_to}
-stack: all
-```
-
-Tail-based sampling requires minimal memory to run, and there should not be a noticeable increase in RSS memory usage. However, since tail-based sampling writes data to disk, it is possible to see a significant increase in OS page cache memory usage due to disk IO. If you see a drop in throughput and excessive disk activity after enabling tail-based sampling, ensure that there is enough memory headroom in the system for OS page cache to perform disk IO efficiently.
-
-
 ## Too many unique transaction names [troubleshooting-too-many-transactions]
 ```yaml {applies_to}
 stack: all