* Small improvements to time estimation.
* Allow multiple NTP servers to be used.
* Removing boxing.
* Be nice.
* Be nicer.
* Update list of servers and add reference.
* Health endpoint.
* Asynchronous health endpoint.
* Configure time api URL via CLI.
* Tests for TimeChecker.
* Health indication on Status page.
* Adding status indication to tab titles.
* Add status to ParityBar.
* Fixing lints.
* Add health status on SyncWarning.
* Fix health URL for embed.
* Nicer messages.
* Fix tests.
* Fixing JS tests.
* NTP time sync (#5956)
* use NTP to check time drift
* update time module documentation
* replace time_api flag with ntp_server
* fix TimeChecker tests
* fix ntp-server flag usage
* hide status tooltip if there's no message to show
* remove TimeProvider trait
* use Cell in FakeNtp test trait
* share fetch client and ntp client cpu pool
* Add documentation to public method.
* Removing peer count from status.
* Remove unknown upgrade status.
* Send two time requests at the time.
* Revert "Send two time requests at the time."
This reverts commit f7b754b1155076a5a5d8fdafa022801fae324452.
* Defer reporting time synchronization issues.
* Fix tests.
* Fix linting.
