Fix/prometheus wrong data dir

[9547]

What problem does this PR solve?

fix #1039

What is changed and how it works?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Code changes

• Has exported function/method change
• Has exported variable/fields change
• Has interface methods change
• Has persistent data change

Side effects

• Possible performance regression
• Increased code complexity
• Breaking backward compatibility

Related changes

• Need to cherry-pick to the release branch
• Need to update the documentation

Release notes:

NONE

[codecov-io]

Codecov Report

Merging #1040 (e97cf20) into master (cbc4e18) will decrease coverage by 15.25%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           master    #1040       +/-   ##
===========================================
- Coverage   55.66%   40.40%   -15.26%     
===========================================
  Files         280      279        -1     
  Lines       19759    19757        -2     
===========================================
- Hits        10999     7983     -3016     
- Misses       7048    10487     +3439     
+ Partials     1712     1287      -425     

Flag	Coverage Δ
cluster	?
dm	23.96% <ø> (-0.02%)	⬇️
integrate	31.77% <100.00%> (-18.18%)	⬇️
playground	20.31% <100.00%> (ø)
tiup	16.50% <ø> (+0.02%)	⬆️
unittest	22.27% <0.00%> (ø)

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

Impacted Files	Coverage Δ
components/playground/monitor.go	84.41% <100.00%> (ø)
components/cluster/main.go	0.00% <0.00%> (-100.00%)	⬇️
pkg/cluster/template/config/config.go	0.00% <0.00%> (-100.00%)	⬇️
pkg/cluster/template/scripts/scripts.go	0.00% <0.00%> (-100.00%)	⬇️
pkg/cluster/spec/bindversion.go	0.00% <0.00%> (-83.34%)	⬇️
pkg/cluster/task/update_meta.go	0.00% <0.00%> (-80.00%)	⬇️
pkg/cluster/template/scripts/tiflash.go	0.00% <0.00%> (-79.60%)	⬇️
pkg/cluster/spec/cdc.go	3.44% <0.00%> (-79.32%)	⬇️
pkg/cluster/template/scripts/tikv.go	0.00% <0.00%> (-76.48%)	⬇️
pkg/cluster/template/scripts/tidb.go	0.00% <0.00%> (-75.00%)	⬇️
... and 105 more

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[lucklove]

/lgtm

[lucklove]

/merge

[ti-chi-bot]

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

Commit hash: e97cf20