dm: add dm hosts to node_exporter list

[AstroProfundis]

What problem does this PR solve?

Fix #1653

What is changed and how it works?

Add hosts of DM nodes to the host list so that prometheus config will be rendered with them as node_exporter targets.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• nexustar

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[codecov-commenter]

Codecov Report

Merging #1654 (ee2a39f) into master (c1bd929) will increase coverage by 27.15%.
The diff coverage is 0.00%.

@@             Coverage Diff             @@
##           master    #1654       +/-   ##
===========================================
+ Coverage   15.55%   42.71%   +27.15%     
===========================================
  Files         151      232       +81     
  Lines       15273    21823     +6550     
===========================================
+ Hits         2376     9321     +6945     
+ Misses      12380    11065     -1315     
- Partials      517     1437      +920     

Flag	Coverage Δ
cluster	42.71% <0.00%> (?)
integrate	42.71% <0.00%> (+27.15%)	⬆️
tiup	?
unittest	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pkg/cluster/spec/monitoring.go	60.33% <0.00%> (+60.33%)	⬆️
pkg/repository/store/store.go	0.00% <0.00%> (-100.00%)	⬇️
pkg/repository/utils/hash.go	0.00% <0.00%> (-83.34%)	⬇️
pkg/repository/model/publish.go	0.00% <0.00%> (-83.34%)	⬇️
pkg/repository/store/local.go	0.00% <0.00%> (-82.61%)	⬇️
pkg/repository/progress.go	23.07% <0.00%> (-76.93%)	⬇️
pkg/telemetry/meta.go	0.00% <0.00%> (-67.40%)	⬇️
pkg/telemetry/telemetry.go	0.00% <0.00%> (-66.67%)	⬇️
pkg/repository/v1manifest/keys.go	5.33% <0.00%> (-58.67%)	⬇️
pkg/repository/merge_mirror.go	0.00% <0.00%> (-58.51%)	⬇️
... and 216 more

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[AstroProfundis]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: ee2a39f