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feat: collect database metrics #17635

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Merged
merged 5 commits into from
May 2, 2025
Merged

feat: collect database metrics #17635

merged 5 commits into from
May 2, 2025

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dannykopping
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Currently we don't have a way to get insight into Postgres connections being exhausted.

By using the prometheus' DBStats collector, we get some insight out-of-the-box.

# HELP go_sql_idle_connections The number of idle connections.
# TYPE go_sql_idle_connections gauge
go_sql_idle_connections{db_name="coder"} 1
# HELP go_sql_in_use_connections The number of connections currently in use.
# TYPE go_sql_in_use_connections gauge
go_sql_in_use_connections{db_name="coder"} 2
# HELP go_sql_max_idle_closed_total The total number of connections closed due to SetMaxIdleConns.
# TYPE go_sql_max_idle_closed_total counter
go_sql_max_idle_closed_total{db_name="coder"} 112
# HELP go_sql_max_idle_time_closed_total The total number of connections closed due to SetConnMaxIdleTime.
# TYPE go_sql_max_idle_time_closed_total counter
go_sql_max_idle_time_closed_total{db_name="coder"} 0
# HELP go_sql_max_lifetime_closed_total The total number of connections closed due to SetConnMaxLifetime.
# TYPE go_sql_max_lifetime_closed_total counter
go_sql_max_lifetime_closed_total{db_name="coder"} 0
# HELP go_sql_max_open_connections Maximum number of open connections to the database.
# TYPE go_sql_max_open_connections gauge
go_sql_max_open_connections{db_name="coder"} 10
# HELP go_sql_open_connections The number of established connections both in use and idle.
# TYPE go_sql_open_connections gauge
go_sql_open_connections{db_name="coder"} 3
# HELP go_sql_wait_count_total The total number of connections waited for.
# TYPE go_sql_wait_count_total counter
go_sql_wait_count_total{db_name="coder"} 28
# HELP go_sql_wait_duration_seconds_total The total time blocked waiting for a new connection.
# TYPE go_sql_wait_duration_seconds_total counter
go_sql_wait_duration_seconds_total{db_name="coder"} 0.086936235

go_sql_wait_count_total is the metric I'm most interested in gaining, but the others are also very useful.

Changing the prefix is easy (prometheus.WrapRegistererWithPrefix), but getting rid of the go_ segment is not quite so easy. I've kept the changeset small for now.

NOTE: I imported a library to determine the database name from the given conn string. It's not as simple as one might hope. The database name is used for the db_name label.

@dannykopping
feat: go database metrics
f13279c 
Signed-off-by: Danny Kopping <[email protected]>
@dannykopping dannykopping changed the title feat: use go's sqldatabase metrics feat: collect database metrics May 1, 2025
johnstcn
johnstcn reviewed May 1, 2025
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This should probably be done instead in enablePrometheus().
I don't see a point registering the collector if prometheus is not enabled for the deployment.

dannykopping
dannykopping commented May 1, 2025
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johnstcn
johnstcn approved these changes May 2, 2025
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@dannykopping
chore: adding comment
b202843 
Signed-off-by: Danny Kopping <[email protected]>
@dannykopping dannykopping merged commit c278662 into main May 2, 2025
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@dannykopping dannykopping deleted the dk/db-metrics branch May 2, 2025 10:17
@github-actions github-actions bot locked and limited conversation to collaborators May 2, 2025
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@johnstcn johnstcn johnstcn approved these changes

@spikecurtis spikecurtis Awaiting requested review from spikecurtis

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@dannykopping @johnstcn @spikecurtis