Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@docs/tutorials/writing-a-health-monitor.md`:
- Around line 227-249: Validate the parsed POLL_INTERVAL_SECONDS value in the
health monitor startup flow before creating the ticker in the polling loop. In
the section that currently parses pollSeconds and later calls time.NewTicker,
add a guard to reject zero or negative values and return a clear error instead
of proceeding. Keep the fix near the existing POLL_INTERVAL_SECONDS handling so
the failure is caught before the ticker is constructed.
- Around line 520-530: The setup steps in the tutorial need to be reordered
because `go get github.com/nvidia/nvsentinel/commons@v0.0.0` will fail in a
fresh checkout until the local replacement is already in place. Update the
instructions in the `writing-a-health-monitor` section so the `go.mod` replace
for `github.com/nvidia/nvsentinel/commons` is added first (or via `go mod edit
-replace`) before running `go get`, keeping the dependency fetch step after the
replace is configured.

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@docs/tutorials/writing-a-health-monitor.md`:
- Around line 15-19: The blockquotes in the tutorial markdown currently contain
blank lines that trigger markdownlint MD028, so tighten the copy in the affected
section and the repeated block around Appendix C by removing the internal blank
lines or splitting each quoted paragraph into separate blockquote blocks. Update
the relevant markdown text in the tutorial content so the quoted lines remain
readable but no longer have blank lines inside the same blockquote.
- Around line 263-265: The trigger-file check is treating all stat failures as
“healthy,” which can hide permission or I/O problems and clear an active fault;
update the fileExists helper and the demo check logic so only os.IsNotExist is
interpreted as the file being absent. Return the error from fileExists instead
of collapsing every os.Stat failure to false, and in the demo check path that
logs with slog.Info, propagate non-not-exist errors as unhealthy rather than
deriving healthy solely from fileExists. Apply the same fix to both occurrences
referenced by the demo snippets so the health monitor behavior is consistent.

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Outside diff comments:
In `@docs/tutorials/writing-a-health-monitor.md`:
- Line 40: The diagram and deploy instructions use mismatched socket paths, so
update the health monitor docs to make the mount target and the gRPC URI refer
to the same location. Adjust the wording and diagram in the
writing-a-health-monitor tutorial around the monitor-to-Platform Connector
connection so the socket path shown for the monitor matches the hostPath mount
used in the deployment step.

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@docs/tutorials/writing-a-health-monitor.md`:
- Around line 626-651: The publish example currently introduces fakePC but does
not use it, and the guidance about healthpub.New is incomplete. Update the
tutorial section around fakePC, TestBuildEvent_Unhealthy, and the Publish
example so the fake client is actually used when demonstrating delivery through
healthpub, or remove the fakePC mention entirely if only buildEvent is being
tested. Make the example consistent with the non-unix target behavior of
healthpub.New so the fakePC path is exercised instead of left unused.

---

Nitpick comments:
In `@docs/tutorials/writing-a-health-monitor.md`:
- Around line 152-173: The `go.mod` scaffold wording is inconsistent with the
snippet because it claims “two local replace directives” even though this
section only adds the `data-models` replace and introduces `commons` later in
section 8. Update the tutorial text around the `go.mod` example to say this
scaffold includes the local replace for `data-models` only, and mention that the
`commons` replace is added later when the production publisher is introduced, so
readers do not think a step is missing.