Leo Hemsted 6e32ca5996 add prometheus metrics for connection pools (both web and sql) ...

add the following prometheus metrics to keep track of general app
instance health.

 # sqs_apply_async_duration

how long does the actual SQS call (a standard web request to AWS) take.
a histogram with default bucket sizes, split up per task that was
created.

 # concurrent_web_request_count

how many web requests is this app currently serving. this is split up
per process, so we'd expect multiple responses per app instance

 # db_connection_total_connected

how many connections does this app (process) have open to the database.
They might be idle.

 # db_connection_total_checked_out

how many connections does this app (process) have open that are
currently in use by a web worker

 # db_connection_open_duration_seconds

a histogram per endpoint of how long the db connection was taken from
the pool for. won't have any data if a connection was never opened.

2020-06-12 14:52:22 +01:00

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