Fix code issues

Please Elaborate on the issues and how to reproduce the issues.

On running phpcs based on drupal standard using the command:
vendor/bin/phpcs --standard=Drupal,DrupalPractice --extensions=php,module,inc,install,test,profile,theme,css,info,txt,md,yml web/modules/contrib/search_api_monitor

Below errors are encountered:

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FOUND 1 ERROR AFFECTING 1 LINE
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6 | ERROR | [x] Expected 1 newline at end of file; 2 found
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PHPCBF CAN FIX THE 1 MARKED SNIFF VIOLATIONS AUTOMATICALLY
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FILE: /Users/adil.shiddiqui/drupal9/web/modules/contrib/search_api_monitor/src/Controller/MonitorController.php
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FOUND 4 ERRORS AND 2 WARNINGS AFFECTING 6 LINES
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8 | ERROR | [x] Missing class doc comment
10 | ERROR | [x] Missing function doc comment
11 | WARNING | [ ] \Drupal calls should be avoided in classes, use dependency injection instead
17 | WARNING | [ ] \Drupal calls should be avoided in classes, use dependency injection instead
27 | ERROR | [x] Expected 1 blank line after function; 0 found
28 | ERROR | [x] The closing brace for the class must have an empty line before it
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PHPCBF CAN FIX THE 4 MARKED SNIFF VIOLATIONS AUTOMATICALLY
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Patch created to solve above phpcs issues

Reviewed #5 All reported issues fixed.

Patch #6 fixes issues reported by phpcs.

Applied patch and ran these commands:
phpcs --standard=DrupalPractice --extensions='php,module,inc,install,test,profile,theme,info,txt,md'
phpcs --standard=Drupal --extensions='php,module,inc,install,test,profile,theme,info,txt,md'

Patch #6 fixes issues reported by phpcs.

Applied patch and ran these commands:
phpcs --standard=DrupalPractice --extensions='php,module,inc,install,test,profile,theme,info,txt,md'
phpcs --standard=Drupal --extensions='php,module,inc,install,test,profile,theme,info,txt,md'