* 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: NGoutham Veeramachaneni <gouthamve@gmail.com>

Signed-off-by: Nyuxiaobo <yuxiaobogo@163.com>

Signed-off-by: NJean-Baptiste Le Duigou <jb.leduigou@gmail.com>

Signed-off-by: NGoutham Veeramachaneni <gouthamve@gmail.com>

Signed-off-by: NKrasi Georgiev <8903888+krasi-georgiev@users.noreply.github.com>

Signed-off-by: Nyuxiaobo <yuxiaobogo@163.com>

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

The WAL Watcher replays a checkpoint after it is created in order to
garbage collect series that no longer exist in the WAL. Currently the
garbage collection process is done serially with reading from the tip of
the WAL which can cause large delays in writing samples to remote
storage just after compaction occurs.

This also fixes a memory leak where dropped series are not cleaned up as
part of the SeriesReset process.
Signed-off-by: NChris Marchbanks <csmarchbanks@gmail.com>

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

* Benchmark for loading WAL
Signed-off-by: NGanesh Vernekar <cs15btech11018@iith.ac.in>

* Add more cases
Signed-off-by: NGanesh Vernekar <cs15btech11018@iith.ac.in>

Signed-off-by: chentanjun <2799194073@qq.com>

* fix wrong spells in live_reader.go
* fix wrong spells in lex.go
Signed-off-by: Nczm <zhongming.chang@daocloud.io>

Signed-off-by: Njohncming <johncming@yahoo.com>

Signed-off-by: Nzhulongcheng <zhulongcheng.dev@gmail.com>

* Move WAL watcher code to tsdb/wal package.
Signed-off-by: NCallum Styan <callumstyan@gmail.com>

* Fix tests after moving WAL watcher code.
Signed-off-by: NCallum Styan <callumstyan@gmail.com>

* Lint fixes.
Signed-off-by: NCallum Styan <callumstyan@gmail.com>

Signed-off-by: NYaoZengzeng <yaozengzeng@zju.edu.cn>

This PR gives the readonly DB the ability to create blocks from the WAL.
In order to implement this, we modify DBReadOnly.Blocks() to return an
empty slice and no error if no blocks are found.
xref: https://github.com/prometheus/tsdb/issues/346#issuecomment-520786524Signed-off-by: NLucas Servén Marín <lserven@gmail.com>

Signed-off-by: Nzhulongcheng <zhulongcheng.dev@gmail.com>

* move the WAL page buf reset in its own func
Signed-off-by: NErfan Besharat <erbesharat@gmail.com>

Signed-off-by: chentanjun <2799194073@qq.com>

Signed-off-by: Nhwdef <hwdef97@gmail.com>

Signed-off-by: Njohncming <johncming@yahoo.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>