query add http api /v1/status

[youngsofun]

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Summary

related issue #4354

add /v1/status which return running_queries_count, last_query_started_at, last_query_finished_at, may add other fields later.

pub struct Status {
    pub running_queries_count: u64,
    // secs since epoch
    pub last_query_started_at: Option<u64>,
    // secs since epoch
    pub last_query_finished_at: Option<u64>,
}

to make it lightweight, maintain the info in sessionManager and update on each query start/finish.

to ignore queries issued by admin api, change session type from string to enum. making it more useful.

Changelog

• New Feature

Related Issues

Fixes #4354

Test Plan

Unit Tests

Stateless Tests

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[mergify]

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[ZhiHanZ]

should we also cover tenant_id and cluster_id? since those things update dynamically

[youngsofun]

ok I will check it

[youngsofun]

@ZhiHanZ

since those things update dynamically

do you mean reload_config, what about get tenant_id and cluster_id through /v1/config?

[flaneur2020]

i guess if the clock got skewed, this might panic the databend instance?

[youngsofun]

we use this in multi place in data bend. resolve it as another issue?

[flaneur2020]

ok to me, we may replace it with a default value on Err to replace the expect

[flaneur2020]

/lgtm

[ZhiHanZ]

nice work