Add more FIXME

Author: carsonip

reference/apm/cloud/apm-settings.md

@@ -121,6 +121,9 @@ The following `apm-server.auth.anonymous.*` settings can be configured to restri
 `apm-server.sampling.tail.interval`
 :   Synchronization interval for multiple APM Servers. Should be in the order of tens of seconds or low minutes.
 
+`apm-server.sampling.tail.ttl`
+:   FIXME
+
 `logging.level`
 :   Sets the minimum log level. The default log level is error. Available log levels are: error, warning, info, or debug.
 

solutions/observability/apm/configure-apm-server.md

@@ -143,6 +143,9 @@ The following `apm-server.auth.anonymous.*` settings can be configured to restri
 `apm-server.sampling.tail.interval`
 :   Synchronization interval for multiple APM Servers. Should be in the order of tens of seconds or low minutes.
 
+`apm-server.sampling.tail.ttl`
+:   FIXME
+
 `logging.level`
 :   Sets the minimum log level. The default log level is error. Available log levels are: error, warning, info, or debug.
 

solutions/observability/apm/transaction-sampling.md

@@ -312,6 +312,15 @@ Synchronization interval for multiple APM Servers. Should be in the order of ten
 | APM Server binary | `sampling.tail.interval` |
 | Fleet-managed | `Interval` |
 
+##### TTL [sampling-tail-ttl]
+
+FIXME
+
+|     |                     |
+| --- |---------------------|
+| APM Server binary | `sampling.tail.ttl` |
+| Fleet-managed | `TTL`               |
+
 ##### Policies [sampling-tail-policies]
 
 Criteria used to match a root transaction to a sample rate.