Fix PID in Memory Sampler

[TimPansino]

Overview

• PID used in memory sampler for metric naming is incorrect in forked processes. Fixed by always getting the PID again.

Related Github Issue

#566

[github-actions[bot]]

MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ PYTHON	bandit	1		0	0.28s
✅ PYTHON	black	1	0	0	0.25s
✅ PYTHON	flake8	1		0	0.21s
✅ PYTHON	isort	1	0	0	0.16s
✅ PYTHON	pylint	1		0	1.16s

See errors details in artifact MegaLinter reports on CI Job page Set VALIDATE_ALL_CODEBASE: true in mega-linter.yml to validate all sources, not only the diff