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If you are using tcWebHooks third-party TeamCity plugin, update it to the latest version before upgrading (details).

(this was a bug existing since version 9.1, so seems like we do not need to announce it's fixing in 2018.1.2 here - https://youtrack.jetbrains.com/issue/TW-42962)
h3. Agent configuration on upgrade
If you choose to perform upgrade of a TeamCity agent running under Windows using TeamCity Windows agent or server installer and the previous agent version is 9.1+ (regularly, agent upgrades automatically and you do not need to run the installer manually), in order not to lose agent settings stored in <TeamCity Agent Home>\config\buildAgent.properties, backup the file before running the installer and restore the file from the backup after the installation procedure.

We increased accuracy for recognizing similar TeamCity exit code build problems. The existing investigations and mutes for these build problems will be reset.

Bundled Tools Updates

The bundled Tomcat has been updated to version 8.5.32.