Looks good to me, but it's code I wrote, so I'll remove myself from reviewers :-)

The functionality , just a tiny nit and request for some additional comments

Reviewable status: complete! 1 of 0 LGTMs obtained (waiting on @abarganier and @rimadeodhar)

pkg/server/import_ts.go, line 75 at r1 (raw file):

		"SET CLUSTER SETTING timeseries.storage.enabled = 'false';",
		"SET CLUSTER SETTING	timeseries.storage.resolution_10s.ttl = '99999h';",
		"SET CLUSTER SETTING	timeseries.storage.resolution_30m.ttl = '99999h';",

nit: swap tab for space after SET CLUSTER SETTING to stay consistent with the first two strings.

Code quote:

		"SET CLUSTER SETTING	timeseries.storage.resolution_10s.ttl = '99999h';",
		"SET CLUSTER SETTING	timeseries.storage.resolution_30m.ttl = '99999h';",

pkg/server/import_ts.go, line 88 at r1 (raw file):

	}
	if tsImport == "-" {
		// YOLO mode to look at timeseries after previous import error.

nit: Can we provide a bit more context in the comments about how this works? Being new to tsdump it took a bit for me to realize that this indicates that the tsdump data was already imported in the previous attempt to start the node, but with errors. Before realizing this, my thought was, "So if we return nil and return early, then how does the data get imported?". Elaborating that here might be helpful 🙂.

Code quote:

	if tsImport == "-" {
		// YOLO mode to look at timeseries after previous import error.
		return nil
	}