SLT-1136: Drupal chart: Use JSON as the default formatter for application logs when handled by monolog

[k4lv15]

Adjust the default monolog channel handler:

• set formater to JSON to have structured Drupal logs
• specify default log processors
• override monolog's filter_backtrace processor to remove redundant log data which makes sense in Drupal UI but not on stderr

[Jancis]

Works as expected, can see structured log picked up by otel and displayed in logging system.
Not excited that the log format is json by default, but worth it if it makes it easier for developers to navigate logs.

PR Overview

A PR to update the monolog channel handler configuration to format Drupal application logs as structured JSON and optimize log data by overriding the "filter_backtrace" processor.

• Change the configuration from a simple stream handler list to a structured dictionary including formatters and processors.
• Override the "filter_backtrace" processor to exclude the "link" context, reducing redundant log data.

Reviewed Changes

File	Description
charts/drupal/files/silta.services.yml	Updates handler configuration and processor override

Copilot reviewed 1 out of 1 changed files in this pull request and generated no comments.

Comments suppressed due to low confidence (2)

charts/drupal/files/silta.services.yml:3

• Please verify that changing the 'monolog.channel_handlers' value from a list to a dictionary structure does not break existing references or expectations in the codebase.

default:

charts/drupal/files/silta.services.yml:24

• Confirm that overriding the 'filter_backtrace' processor with a non-shared instance meets the intended logging behavior and does not lead to unexpected processor lifecycle issues.

monolog.processor.filter_backtrace: