generate metrics profile error

[crazycs520]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

In dashboard

In command line

> dot -T svg -o profile.svg profile.dot
Error: Edge length 261674.952148 larger than maximum 65535 allowed.
Check for overwide node(s).

2. What did you expect to see? (Required)

3. What did you see instead (Required)

4. What is your TiDB version? (Required)

master

[ti-srebot]

Please edit this comment to complete the following information

Bug

Note: Make Sure that 'component', and 'severity' labels are added
Example for how to fill out the template: #20100

1. Root Cause Analysis (RCA)

No font size limit when generating metric profile.

2. Symptom

generate metrics profile error.

3. All Trigger Conditions

N/A

4. Workaround (optional)

N/A

5. Affected versions

v4.0.7

6. Fixed versions

v4.0.8

[ti-srebot]

( RCA AllTriggerConditions FixedVersions AffectedVersions Symptom component/sig(label) severity(label) ) fields are empty,the values in () fields are incorrect.

[seiya-annie]

add sig/execute and sig/ddl label based on pr.
add severity/minor lable