Merge branch 'master' into docs

docs/sources/index.md

@@ -22,7 +22,7 @@ a number of ways to get help:
 - [Gitter room](https://gitter.im/alexanderzobnin/grafana-zabbix)
 - [Twitter](https://twitter.com/AlexanderZobnin)
 
-Or you can just send me [email](mailto:alexanderzobnin@gmail.com).
+Or you can send me [email](mailto:alexanderzobnin@gmail.com).
 
 ## Support Project
 I develop this project in my free time, but if you really find it helpful and promising, you can
@@ -34,5 +34,5 @@ Triggers panel was sponsored by [Core IT Project](http://coreit.fr/)).
 
 By utilizing this software, you agree to the terms of the included license. Grafana-Zabbix plugin is
 licensed under the Apache 2.0 agreement. See
-[LICENSE](https://github.com/alexanderzobnin/grafana-zabbix/blob/master/LICENSE.md) for the full
+[LICENSE](https://github.com/alexanderzobnin/grafana-zabbix/blob/master/LICENSE) for the full
 license terms.

docs/sources/reference/functions.md

@@ -30,6 +30,13 @@ scale(100)
 scale(0.01)
 ```
 
+### delta
+```
+delta()
+```
+Convert absolute values to delta, for example, bits to bits/sec.
+
+
 Aggregate
 ---------
 
@@ -71,6 +78,38 @@ max(interval)
 ```
 **Deprecated**, use `aggregateBy(interval, max)` instead.
 
+
+Filter
+---------
+
+### top
+
+```
+top(N, value)
+```
+
+Returns top N series, sorted by _value_, which can be one of: _avg_, _min_, _max_, _median_.
+
+Examples:
+```
+top(10, avg)
+top(5, max)
+```
+
+### bottom
+
+```
+bottom(N, value)
+```
+
+Returns bottom N series, sorted by _value_, which can be one of: _avg_, _min_, _max_, _median_.
+
+Examples:
+```
+bottom(5, avg)
+```
+
+
 ## Trends
 
 ### trendValue