Example/Explain length in QAN limited to 20KB

[pgodinic]

Description

Looks like that Example/Explain length is limited to 20KB. We are using --query-source=slowlog --size-slow-logs=2GiB --disable-tablestats --max-query-length=-1 in PMM agent. 
Most of the queries are shorter than this but we have few that we can't show. In slow query log file i can see whole query.
This is an example of the query.

Here is a query lenght from ClickHouse.
9912770ce518 :) select max(length(fingerprint)),max(length(example)) from pmm.metrics where queryid='33BB234C144D56BE' limit 1;

SELECT
max(length(fingerprint)),
max(length(example))
FROM pmm.metrics
WHERE queryid = '33BB234C144D56BE'
LIMIT 1

Query id: 0b59e7da-cf30-4b47-9477-3dd1e0707e67

┌─max(length(fingerprint))─┬─max(length(example))─┐
│ 27706 │ 20480 │
└──────────────────────────┴──────────────────────┘

Expected Results

Example/Explain should not be truncated on 20KB

Actual Results

Example/Explain were truncated.

• I can see whole query when i hover over query info icon

Version

PMM Server 2.40.1, PMM agent 2.40.1-6.bullseye

Steps to reproduce

Simply run query that is longer than 20KB. It will be truncated on QAN.

Relevant logs

No response

Code of Conduct

• I agree to follow Percona Community Code of Conduct