This document is indended to quickly save upgrade information. During the process of upgrading Tripal Core we're going to place useful information here until it can be more formally written up into docs.
tripal_set_message() and tripal_report_error()
These functions have been upgraded and thus can be used as is. However, the new way is use a logger service as shown below.
$logger = \Drupal::service('tripal.logger');
$logger->notice('Hello world');
$logger->info('Hello world');
$logger->warning('Hello world');
$logger->error('Hello world');