fix: Fix invalid cache_creation_tokens metric key #195
  Add this suggestion to a batch that can be applied as a single commit.
  This suggestion is invalid because no changes were made to the code.
  Suggestions cannot be applied while the pull request is closed.
  Suggestions cannot be applied while viewing a subset of changes.
  Only one suggestion per line can be applied in a batch.
  Add this suggestion to a batch that can be applied as a single commit.
  Applying suggestions on deleted lines is not supported.
  You must change the existing code in this line in order to create a valid suggestion.
  Outdated suggestions cannot be applied.
  This suggestion has been applied or marked resolved.
  Suggestions cannot be applied from pending reviews.
  Suggestions cannot be applied on multi-line comments.
  Suggestions cannot be applied while the pull request is queued to merge.
  Suggestion cannot be applied right now. Please check back later.
  
    
  
    
Issue #, if available:
The key
cacheCreationInputTokensis incorrect.We adopted part of your team’s codebase internally and noticed that prompt caching metrics weren’t working as expected.
To fix this issue, the key should be updated to
cacheWriteInputTokens.Description of changes:
See: https://docs.aws.amazon.com/bedrock/latest/userguide/prompt-caching.html#prompt-caching-get-started
By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.