Here are a few comments on your recent blogpost "Expose application and runtime metrics in Go using the expvar package":

I want to focus at the visits counter at the end of the JSON response.

the JSON response -> this JSON response -- reference slightly more clear I think

The expvar.Map type can be used to make metrics appear under certain name space.

name space -> namespace

Maybe noting that memstats from the previous given '/debug/vars' output is also an namespace (created with expvar.Map)

This value must be recalculated every someone visits http://localhost:1818/debug/vars.

every someone -> every time someone

Together with a custom aggregrator, InfluxDB and Grafana I can monitor my applications very easy.

Not every reader will know about InfluxDB and Grafana, so maybe link those words to their websites.

PS A blogpost about nifty features you particularly like / use in Grafana would be a nice ;)