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docs/troubleshooting: add reduce_mem_usage=1 to export query (#7286)

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### Describe Your Changes

When debugging unexpected query results, add reduce_mem_usage=1 param to
export query to preserve duplicates.

### Checklist

The following checks are **mandatory**:

- [x] My change adheres [VictoriaMetrics contributing
guidelines](https://docs.victoriametrics.com/contributing/).

Signed-off-by: Artem Fetishev <rtm@victoriametrics.com>
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docs/Troubleshooting.md
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@ -129,9 +129,9 @@ If you see unexpected or unreliable query results from VictoriaMetrics, then try
on the given `[start..end]` time range and check whether they are expected:
```sh
single-node: curl http://victoriametrics:8428/api/v1/export -d 'match[]=http_requests_total' -d 'start=...' -d 'end=...'
single-node: curl http://victoriametrics:8428/api/v1/export -d 'match[]=http_requests_total' -d 'start=...' -d 'end=...' -d 'reduce_mem_usage=1'
cluster: curl http://<vmselect>:8481/select/<tenantID>/prometheus/api/v1/export -d 'match[]=http_requests_total' -d 'start=...' -d 'end=...'
cluster: curl http://<vmselect>:8481/select/<tenantID>/prometheus/api/v1/export -d 'match[]=http_requests_total' -d 'start=...' -d 'end=...' -d 'reduce_mem_usage=1'
```
Note that responses returned from [/api/v1/query](https://docs.victoriametrics.com/keyconcepts/#instant-query)
and from [/api/v1/query_range](https://docs.victoriametrics.com/keyconcepts/#range-query) contain **evaluated** data