Datadog

* [Fixed] Revert dogstatsd telemetry. See [530](https://github.com/DataDog/datadogpy/pull/530).
* [Fixed] Fix ServiceLevelObjective.get_all limit default in docstring. See [527](https://github.com/DataDog/datadogpy/pull/527). Thanks [taylor-chen](https://github.com/taylor-chen).

* [Deprecated] Alias `dog` script names as `dogshell`. Please start using `dogshell` instead of `dog` command. See [305](https://github.com/DataDog/datadogpy/pull/305). Thanks [dwminer](https://github.com/dwminer).
* [Fixed] [dogshell] Enforce the default 'normal' event priority client side. See [511](https://github.com/DataDog/datadogpy/pull/511).
* [Fixed] [dogstatsd] Handle EAGAIN socket error when dropping packets. See [515](https://github.com/DataDog/datadogpy/pull/515). Thanks [mrknmc](https://github.com/mrknmc).
* [Fixed] [dogstatsd] Handle OSError on socket.close on Python 3.6+. See [510](https://github.com/DataDog/datadogpy/pull/510). Thanks [charettes](https://github.com/charettes).
* [Added] [dogstatsd] Add `statsd_constant_tags` kwarg to datadog.initialize(). See [494](https://github.com/DataDog/datadogpy/pull/494). Thanks [kainswor](https://github.com/kainswor).
* [Added] [dogstatsd] Adding telemetry to dogstatsd. See [505](https://github.com/DataDog/datadogpy/pull/505).
* [Added] [dogwrap] Add duration as metric. See [506](https://github.com/DataDog/datadogpy/pull/506).
* [Added] [dogwrap] Add option to send to EU endpoint. See [502](https://github.com/DataDog/datadogpy/pull/502).
* [Added] [dogwrap] Add warning option for dogwrap based on exit codes. See [471](https://github.com/DataDog/datadogpy/pull/471). Thanks [dabcoder](https://github.com/dabcoder).
* [Added] Include LICENSE in MANIFEST.in. See [500](https://github.com/DataDog/datadogpy/pull/500). Thanks [jjhelmus](https://github.com/jjhelmus).
* [Added] Add base class for all exceptions. See [496](https://github.com/DataDog/datadogpy/pull/496). Thanks [hakamadare](https://github.com/hakamadare).
* [Added] Tag normalization. See [489](https://github.com/DataDog/datadogpy/pull/489).

* [FEATURE] Roles and Permissions APIs [481][]
* [FEATURE] Add support for Azure, GCP and AWS integrations endpoints [429][]
* [FEATURE] Add support for new `Monitor.can_delete` endpoint [474][]
* [FEATURE] Add support for the `Monitor.validate` endpoint [487][]
* [FEATURE] Add support for `/v1/downtime/cancel/by_scope` [488][]
* [IMPROVEMENT] Dogshell: remove Exception wrapping [477][]

* [BUGFIX] Fix distribution metric submission by sending api/app keys through query params for this endpoint. [480][]
* [FEATURE] Add Synthetics support [433][]

* [BUGFIX] Fix possible issue that could leak file descriptors when reading config [425][]
* [BUGFIX] Fix graph snapshot status endpoint [448][]
* [BUGFIX] Revert `users` resource name to singular `user` as it was not fully supported [450][]
* [BUGFIX] Fix error printing to stderr char by char [449][]
* [BUGFIX] Add `_return_raw_response` to `api` module to prevent import errors before `initialize` is called [461][]
* [BUGFIX] Threadstats: Fix periodic timer error on interpreter shutdown [423][]
* [FEATURE] Add support for SLOs [453][] and [464][]
* [FEATURE] Add ability to send compressed payloads for metrics and distribution. [466][]
* [FEATURE] Add parameter `hostname_from_config` to `initialize` to enable/disable hostname lookup from datadog-agent config to avoid warnings [428][]
* [FEATURE] Dogstatsd: add ability to specify a default sample rate for all submissions [470][] (thanks [dtao][])
* [IMPROVEMENT] Send API credentials through headers instead of URL query parameter [446][]
* [IMPROVEMENT] Clarify docstring for metrics API [463][]
* [IMPROVEMENT] Assert `alert_type` is correct when creating event [467][]
* [IMPROVEMENT] Dogshell: make query and type optional when updating a monitor [447][]

* [BUGFIX] Treat `API_HOST` as URL, not as string [411][]
* [FEATURE] Add `return_raw_response` option to `initialize` to enable adding raw responses to return values [414][]
* [IMPROVEMENT] Add project URLs to package metadata [413][] (thanks [Tenzer][])
* [IMPROVEMENT] Add support for handling a 401 status as an API error [418][]
* [IMPROVEMENT] Allow configuring proxy in `~/.dogrc` for usage with dogshell [415][]
* [IMPROVEMENT] Update `user` resource name to `users` to match new plural endpoints [421][]
* [OTHER] Add deprecation warning to old aws lambda threadstats integration [417][]
* [OTHER] Removed functionality to delete events and comments, as it's no longer supported by API [420][]