minor #17166 Add placeholders into log messages (hason)
minor #17166 Add placeholders into log messages (hason)

This PR was merged into the 3.1-dev branch.

Discussion
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Add placeholders into log messages

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #15753
| License       | MIT
| Doc PR        |

Commits
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c92fcdb Added placeholders to all log messages instead of hardcoded values

symfony/Routing