Loki 1.9.x LogQL in Grafana 7

Documentation : https://sbcode.net/grafana/logql/
Course Coupons : https://sbcode.net/coupons

Now that we have a loki data source we can query it with the LogQL query language.

In this video, we will try out many LogQL queries in the 'systemd-journal' stream selector that we just set up.

There are two types of LogQL queries:
1. Log queries returning the contents of log lines as streams.
2. Metric queries that convert logs into value matrixes.

A LogQL query consists of,
1. The log stream selector
2. Filter expression

We can use operations on both the log stream selectors and filter expressions to refine them.

0:00 Introduction. LogQL
0:40 Log Stream Selectors
1:45 Log Stream Selector Operators
4:40 Filter Expressions
7:30 Range and Instance Vectors
9:05 Vector Functions
14:40 Aggregate Functions
16:20 Aggregate Grouping
17:55 Comparison Operators
18:30 Logic Operators
19:00 Arithmetic Operators
19:33 Operator Order
21:10 Create a Dashboard using LogQL Queries

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