* Adding TSDB Head Stats like cardinality to Status Page
Signed-off-by: NSharad Gaur <sgaur@splunk.com>

* Moving mutx to Head
Signed-off-by: NSharad Gaur <sgaur@splunk.com>

* Renaming variabls
Signed-off-by: NSharad Gaur <sgaur@splunk.com>

* Renaming variabls and html
Signed-off-by: NSharad Gaur <sgaur@splunk.com>

* Removing unwanted whitespaces
Signed-off-by: NSharad Gaur <sgaur@splunk.com>

* Adding Tests, Banchmarks and Max Heap for Postings Stats
Signed-off-by: NSharad Gaur <sgaur@splunk.com>

* Adding more tests for postingstats and web handler
Signed-off-by: NSharad Gaur <sgaur@splunk.com>

* Adding more tests for postingstats and web handler
Signed-off-by: NSharad Gaur <sgaur@splunk.com>

* Remove generated asset file that is no longer used
Signed-off-by: NChris Marchbanks <csmarchbanks@gmail.com>

* Changing comment and variable name for more readability
Signed-off-by: NSharad Gaur <sgaur@splunk.com>

* Using time.Duration in postings status function and removing refresh button from web page
Signed-off-by: NSharad Gaur <sgaur@splunk.com>

Signed-off-by: NChris Marchbanks <csmarchbanks@gmail.com>

Signed-off-by: NBartek Plotka <bwplotka@gmail.com>

Signed-off-by: NGanesh Vernekar <cs15btech11018@iith.ac.in>

Signed-off-by: NGanesh Vernekar <cs15btech11018@iith.ac.in>