Google Account Activity gives you a monthly summary of your account activity across many Google products
With Account Activity Reports you can learn what’s going on in your account, e.g. how many emails you have sent and received, how often you have searched on Google, from which countries you have logged in and how often your YouTube videos have been viewed.
Every month the Account Activity Report will collect and summarise data across your Google account – e.g. sent emails or top searches. Data deletion at the data source, e.g. in your Web History will have no impact on issued reports, although reports can be deleted at any time.
You can set to send an email every time a new report is available. You can change this from the settings and you can even pause the report generation.
You can opt in to Google Account activity beta. Go to https://www.google.com/settings/activity/signup/?hl=en-GB