Add support for Datastore Statistics

[dhermes]

See googleapis/google-cloud-datastore#62

SELECT * FROM __Stat_Total__

is an example for adding some support.

[dhermes]

More general doc:
https://cloud.google.com/datastore/docs/concepts/stats

[dhermes]

There are 9 properties which can be used both for non-namespace stats and namespace stats:

__Stat_(Ns_|)PropertyName_Kind__
__Stat_(Ns_|)PropertyType_PropertyName_Kind__
__Stat_(Ns_|)Kind__
__Stat_(Ns_|)Kind_IsRootEntity__
__Stat_(Ns_|)Kind_NotRootEntity__
__Stat_(Ns_|)PropertyType_Kind__
__Stat_(Ns_|)Kind_CompositeIndex__
__Stat_(Ns_|)PropertyType__
__Stat_(Ns_|)Total__

In addition there is a 10th (or 19th, depending on how you are counting) property

__Stat_Namespace__

[dhermes]

Performing queries like

query = client.query(kind='__Stat_PropertyName_Kind__')
query_iter = query.fetch()
entities, more_results, cursor = query_iter.next_page()

seem to indicate that there are only 10 entities for some kinds and the key names correspond to the actual data in the datastore (hence the number of results will vary based on an app's schema).

---

For the '__Stat_Total__' kind, it seems there is only one key

total_key = client.key('__Stat_Total__', 'total_entity_usage')
total_key = client.key('__Stat_Ns_Total__', 'total_entity_usage',
                       namespace='some-namespace')

[lukesneeringer]

Hello,
One of the challenges of maintaining a large open source project is that sometimes, you can bite off more than you can chew. As the lead maintainer of google-cloud-python, I can definitely say that I have let the issues here pile up.

As part of trying to get things under control (as well as to empower us to provide better customer service in the future), I am declaring a "bankruptcy" of sorts on many of the old issues, especially those likely to have been addressed or made obsolete by more recent updates.

My goal is to close stale issues whose relevance or solution is no longer immediately evident, and which appear to be of lower importance. I believe in good faith that this is one of those issues, but I am scanning quickly and may occasionally be wrong. If this is an issue of high importance, please comment here and we will reconsider. If this is an issue whose solution is trivial, please consider providing a pull request.

Thank you!

[sungmoring]

total_key = client.key('Stat_Total', 'total_entity_usage')
total_key = client.key('Stat_Ns_Total', 'total_entity_usage',
namespace='some-namespace')

How to do this in C# ?

[chemelnucfin]

Does this help?
dotnet-docs-samples

You might have better luck here?