[monitor-config] fix: config optim

[mengchengTang]

What does this PR do?

This PR cleans the bundled Prometheus config by removing accidentally committed runtime scrape targets. It also stages bundled Grafana dashboards into the runtime directory and provisions Grafana from that runtime copy, while preserving user-added runtime dashboard files.

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[gemini-code-assist]

Code Review

This pull request updates the documentation and runtime logic for Grafana dashboards in RL-Insight. Specifically, it introduces a staging step (_stage_grafana_dashboards) that copies bundled dashboard JSON files from the package directory to a runtime directory (~/.rl-insight/runtime/dashboards) at startup, and configures Grafana to provision from there. It also cleans up the default Prometheus scrape configurations. The review feedback highlights several edge cases in the new staging function that could lead to runtime errors, such as handling missing configuration values, safely removing existing files or symlinks at the target path, and ensuring the source path is a directory before iterating over it.

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[gemini-code-assist]

If grafana.dashboards_dir is not configured or is set to None, OmegaConf.select will return None. Converting None to a string results in "None", which then resolves to a path named "None" in the current working directory. We should safely handle the case where grafana.dashboards_dir is missing or None before resolving it.

Suggested change

	source = Path(str(OmegaConf.select(conf, "grafana.dashboards_dir"))).resolve()
	target = (runtime_dir / "dashboards").resolve()
	if source == target:
	target.mkdir(parents=True, exist_ok=True)
	return target
	target = (runtime_dir / "dashboards").resolve()
	dashboards_dir = OmegaConf.select(conf, "grafana.dashboards_dir")
	if not dashboards_dir:
	target.mkdir(parents=True, exist_ok=True)
	return target
	source = Path(str(dashboards_dir)).resolve()
	if source == target:
	target.mkdir(parents=True, exist_ok=True)
	return target

[mengchengTang]

fix. the code removed

[gemini-code-assist]

If target exists but is a file or a symlink, calling shutil.rmtree(target) will raise an exception (e.g., NotADirectoryError). It is safer to check if target is a directory and not a symlink before calling shutil.rmtree, and otherwise use target.unlink() to remove it.

Suggested change

	if target.exists():
	shutil.rmtree(target)
	target.mkdir(parents=True, exist_ok=True)
	if target.exists() or target.is_symlink():
	if target.is_dir() and not target.is_symlink():
	shutil.rmtree(target)
	else:
	target.unlink()
	target.mkdir(parents=True, exist_ok=True)

[mengchengTang]

fix. the code removed

[gemini-code-assist]

If source exists but is a file instead of a directory, calling source.iterdir() on the next line will raise a NotADirectoryError. We should ensure that source is a directory before attempting to iterate over its contents.

Suggested change

	if not source.exists():
	return target
	if not source.exists() or not source.is_dir():
	return target

[mengchengTang]

fix. the code removed