Subquery blog post (#1248)
Subquery blog post (#1248)

* Subquery blog post

Signed-off-by: Ganesh Vernekar <cb5593e95c6f4f9d31a7d363cec8452e89af4967@iith.ac.in>

* Fix review comments

Signed-off-by: Ganesh Vernekar <cb5593e95c6f4f9d31a7d363cec8452e89af4967@iith.ac.in>

* Fix review comments

Signed-off-by: Ganesh Vernekar <cb5593e95c6f4f9d31a7d363cec8452e89af4967@iith.ac.in>

* Breakdown an example and fix review comments

Signed-off-by: Ganesh Vernekar <cb5593e95c6f4f9d31a7d363cec8452e89af4967@iith.ac.in>

* Elaboration on usage of default evaluation interval

Signed-off-by: Ganesh Vernekar <cb5593e95c6f4f9d31a7d363cec8452e89af4967@iith.ac.in>

* Rename file. Add example in motivation.

Signed-off-by: Ganesh Vernekar <cb5593e95c6f4f9d31a7d363cec8452e89af4967@iith.ac.in>

* Update date to 28 Jan 2019

Signed-off-by: Ganesh Vernekar <cb5593e95c6f4f9d31a7d363cec8452e89af4967@iith.ac.in>

* nits

Signed-off-by: Ganesh Vernekar <cb5593e95c6f4f9d31a7d363cec8452e89af4967@iith.ac.in>

* nits

Signed-off-by: Ganesh Vernekar <cb5593e95c6f4f9d31a7d363cec8452e89af4967@iith.ac.in>

* Suggestion by @bwplotka

Signed-off-by: Ganesh Vernekar <cb5593e95c6f4f9d31a7d363cec8452e89af4967@iith.ac.in>

prometheus/docs,prometheus/docs,prometheus/docs