[proxysql] A new agent check for ProxySQL

[ovaistariq]

What does this PR do?

This PR introduces a new agent check for ProxySQL which is a high performance MySQL proxy. ProxySQL is officially supported by Percona and is the recommended load balancer for Percona XtraDB Cluster.

Motivation

ProxySQL is a commonly used database proxy in MySQL and Percona XtraDB Cluster deployments, and Datadog is a popular monitoring tool. Datadog currently doesn't have any agent check for ProxySQL, hence adding this agent check to Datadog will benefit other users in the community.

Testing Guidelines

An overview on testing
is available in our contribution guidelines.

Additional Notes

Not applicable.

[masci]

Hi @ovaistariq and thanks for your code!
We're in the process of moving all the checks to their own repo and this PR will be likely merged here: https://github.com/DataDog/integrations-extras

Feel free to reopen this against the new repo, otherwise we will take care of moving this after releasing 5.12

[masci]

Hi @ovaistariq,

Thanks again for your contribution, always very much appreciated. We're currently transitioning our checks to a new SDK-based model for the agent. An unfortunate side-effect is that we have to impose a freeze on the dd-agent repo. The SDK consists of two repositories https://github.com/DataDog/integrations-core and https://github.com/DataDog/integrations-extras, where all of our checks will reside. This PR would belong in the core/extras repository. Would you be so kind as to re-open the PR there? We have facilitated some tools to help you with the SDK development that should help you get up and running in no time: sdk guide datadog sdk gem. We are very sorry for the inconvenience caused.

Thank you for your patience as we make this transition!

[truthbk]

@cberry777, @masci and I, we've taken the liberty of opening a PR here to help you transition to the SDK DataDog/integrations-extras#39

We created a patch with your work and dropped it that PR. Please feel free to continue your work there. 🙇

[cberry777]

THANKS!!! From: Jaime Fullaondo <notifications@github.com> Reply-To: DataDog/dd-agent <reply@reply.github.com> Date: Tuesday, January 31, 2017 at 5:21 PM To: DataDog/dd-agent <dd-agent@noreply.github.com> Cc: Chris Berry <cberry@homeaway.com>, Mention <mention@noreply.github.com> Subject: Re: [DataDog/dd-agent] [proxysql] A new agent check for ProxySQL (#3107) @cberry777<https://github.com/cberry777>, @masci<https://github.com/masci> and I, we've taken the liberty of opening a PR here to help you transition to the SDK DataDog/integrations-extras#39<DataDog/integrations-extras#39> We created a patch with your work and dropped it that PR. Please feel free to continue your work there. 🙇 — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub<#3107 (comment)>, or mute the thread<https://github.com/notifications/unsubscribe-auth/ANJ0k2w2tw2BdydvgCPNcbkpj9FfZ3qdks5rX8IGgaJpZM4LbcH1>.