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Update query profiler docs to remove self-managed only

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Query profiler works in ClickHouse Cloud - update docs to reflect it and add an example. 

cc @alexey-milovidov
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Tanya Bragin 2023-03-20 22:05:10 -07:00 committed by GitHub
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docs/en/operations/optimizing-performance/sampling-query-profiler.md
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@ -7,11 +7,23 @@ import SelfManaged from '@site/docs/en/_snippets/_self_managed_only_no_roadmap.m
# Sampling Query Profiler
<SelfManaged />
ClickHouse runs sampling profiler that allows analyzing query execution. Using profiler you can find source code routines that used the most frequently during query execution. You can trace CPU time and wall-clock time spent including idle time.
To use profiler:
Query profiler is automatically enabled in ClickHouse Cloud and you can run a sample query as follows
``` sql
SELECT
count(),
arrayStringConcat(arrayMap(x -> concat(demangle(addressToSymbol(x)), '\n ', addressToLine(x)), trace), '\n') AS sym
FROM system.trace_log
WHERE (query_id = 'ebca3574-ad0a-400a-9cbc-dca382f5998c') AND (event_date = today())
GROUP BY trace
ORDER BY count() DESC
LIMIT 10
SETTINGS allow_introspection_functions = 1
```
In self-managed deployments, to use query profiler:
- Setup the [trace_log](../../operations/server-configuration-parameters/settings.md#server_configuration_parameters-trace_log) section of the server configuration.