Metrics don't update

I can connect to the metrics http endpoint when I add a metrics config.
```yaml
metrics:
host: "0.0.0.0"
port: 8000
```

And sending a request to that endpoint.
```bash
taylor@MacBook-Pro-2 ~ % curl http://127.0.0.1:8000/metrics
# HELP dss_concurrent_connections Number of clients concurrently connected to this instance of dolt sql server
# TYPE dss_concurrent_connections gauge
dss_concurrent_connections 0
# HELP dss_concurrent_queries Number of queries concurrently being run on this instance of dolt sql server
# TYPE dss_concurrent_queries gauge
dss_concurrent_queries 0
# HELP dss_connects Count of server connects
# TYPE dss_connects counter
dss_connects 0
# HELP dss_disconnects Count of server disconnects
# TYPE dss_disconnects counter
dss_disconnects 0
# HELP dss_dolt_version The version of dolt currently running on the machine
# TYPE dss_dolt_version gauge
dss_dolt_version 983040
# HELP dss_query_duration Histogram of dolt sql server query runtimes
# TYPE dss_query_duration histogram
dss_query_duration_bucket{le="0.01"} 0
dss_query_duration_bucket{le="0.1"} 0
dss_query_duration_bucket{le="1"} 0
dss_query_duration_bucket{le="10"} 0
dss_query_duration_bucket{le="100"} 0
dss_query_duration_bucket{le="1000"} 0
dss_query_duration_bucket{le="+Inf"} 0
dss_query_duration_sum 0
dss_query_duration_count 0
# HELP go_gc_duration_seconds A summary of the pause duration of garbage collection cycles.
# TYPE go_gc_duration_seconds summary
go_gc_duration_seconds{quantile="0"} 1.1708e-05
go_gc_duration_seconds{quantile="0.25"} 1.4625e-05
go_gc_duration_seconds{quantile="0.5"} 2.6583e-05
go_gc_duration_seconds{quantile="0.75"} 2.9417e-05
go_gc_duration_seconds{quantile="1"} 7.2375e-05
go_gc_duration_seconds_sum 0.000154708
go_gc_duration_seconds_count 5

...more metrics
```

But if I do something that should update one of the metrics like connect to the server, that field does not update (`dss_concurrent_connections` should change from 0 to 1)