fix(server/logging): use structured message template not string formatting at runtime

[iainsproat]

• string formatting causes high cardinality of messages in the logging system, which makes it difficult to group and filter them.

Description & motivation

Changes:

To-do before merge:

Screenshots:

Validation of changes:

Checklist:

• My pull request follows the guidelines in the Contributing guide?
• My pull request does not duplicate any other open Pull Requests for the same update/change?
• My commits are related to the pull request and do not amend unrelated code or documentation.
• My code follows a similar style to existing code.
• I have added appropriate tests.
• I have updated or added relevant documentation.

References