fix(inputs.mysql): Enforce float for all known floating-point information

[srebhan]

Summary

Avoid type conflicts by pinning more Galera fields to float.

Checklist

• No AI generated code was used in this PR

Related issues

resolves #15786

[dmgeurts]

Installed on one node, will keep you posted

[dmgeurts]

Having removed the processors I now get the following error. MySQL reporting what should be float zero values as 0 (instead of 0.0) appears to cause trouble as these zero values end up wrongly interpreted as an integer.

Aug 29 17:41:30 sql.domain.com telegraf[3423853]: 2024-08-29T15:41:30Z E! [outputs.influxdb_v2] Failed to write metric to mysql (will be dropped: 422 Unprocessable Entity): unprocessable entity: failure writing points to database: partial write: field type conflict: input field "wsrep_apply_oool" on measurement "mysql" is type integer, already exists as type float dropped=1

SQL output of the and related values:

MariaDB [(none)]> SHOW STATUS LIKE 'wsrep_apply_%';
+--------------------+-------------+
| Variable_name      | Value       |
+--------------------+-------------+
| wsrep_apply_oooe   | 0.000437637 |
| wsrep_apply_oool   | 0           |
| wsrep_apply_window | 1.00044     |
| wsrep_apply_waits  | 0           |
+--------------------+-------------+
4 rows in set (0.001 sec)

If it helps, some example values can be found here: https://galeracluster.com/library/documentation/galera-status-variables.html

[srebhan]

🤦 I think we need to bite the bullet and put all float values explicitly as float in there. Do you have a list of what should be a float? Otherwise I need to grep this out of the document you linked...

[telegraf-tiger]

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