chore: set strum::Display for LogLevel to uppercase (#808)

* chore: set strum::Display for LogLevel to uppercase

* update changelog

Author: xeniape

crates/stackable-operator/CHANGELOG.md

@@ -8,9 +8,10 @@ All notable changes to this project will be documented in this file.
 
 ### Added
 
-- Derive `strum::Display` for `LogLevel`([#805]).
+- Derive `strum::Display` for `LogLevel`([#805], [#808]).
 
 [#805]: https://github.com/stackabletech/operator-rs/pull/805
+[#808]: https://github.com/stackabletech/operator-rs/pull/808
 
 ## [0.69.0] - 2024-06-03
 

crates/stackable-operator/src/product_logging/spec.rs

@@ -301,6 +301,7 @@ pub struct AppenderConfig {
 }
 
 /// Log levels
+// Caution: Changing the output format for strum::Display might break operators relying on this trait.
 #[derive(
     Clone,
     Copy,
@@ -316,7 +317,6 @@ pub struct AppenderConfig {
     strum::Display,
 )]
 #[derivative(Default)]
-#[strum(serialize_all = "lowercase")]
 pub enum LogLevel {
     TRACE,
     DEBUG,