More issue templates

.github/ISSUE_TEMPLATE/backward-compatibility.md

@@ -0,0 +1,27 @@
+---
+name: Backward compatibility issue
+about: Create a report to help us improve ClickHouse
+title: ''
+labels: backward compatibility
+assignees: ''
+
+---
+
+(you don't have to strictly follow this form)
+
+**Describe the issue**
+A clear and concise description of what works not as it is supposed to.
+
+**How to reproduce**
+* Which ClickHouse server versions are incompatible
+* Which interface to use, if matters
+* Non-default settings, if any
+* `CREATE TABLE` statements for all tables involved
+* Sample data for all these tables, use [clickhouse-obfuscator](https://github.com/ClickHouse/ClickHouse/blob/master/dbms/programs/obfuscator/Obfuscator.cpp#L42-L80) if necessary
+* Queries to run that lead to unexpected result
+
+**Error message and/or stacktrace**
+If applicable, add screenshots to help explain your problem.
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/bug-report.md

@@ -1,5 +1,5 @@
 ---
-name: Bug report or unexpected behaviour
+name: Bug report
 about: Create a report to help us improve ClickHouse
 title: ''
 labels: bug
@@ -9,7 +9,7 @@ assignees: ''
 
 (you don't have to strictly follow this form)
 
-**Describe the bug or unexpected behaviour**
+**Describe the bug**
 A clear and concise description of what works not as it is supposed to.
 
 **How to reproduce**

.github/ISSUE_TEMPLATE/unexpected-behaviour.md

@@ -0,0 +1,30 @@
+---
+name: Unexpected behaviour
+about: Create a report to help us improve ClickHouse
+title: ''
+labels: unexpected behaviour
+assignees: ''
+
+---
+
+(you don't have to strictly follow this form)
+
+**Describe the unexpected behaviour**
+A clear and concise description of what works not as it is supposed to.
+
+**How to reproduce**
+* Which ClickHouse server version to use
+* Which interface to use, if matters
+* Non-default settings, if any
+* `CREATE TABLE` statements for all tables involved
+* Sample data for all these tables, use [clickhouse-obfuscator](https://github.com/ClickHouse/ClickHouse/blob/master/dbms/programs/obfuscator/Obfuscator.cpp#L42-L80) if necessary
+* Queries to run that lead to unexpected result
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Error message and/or stacktrace**
+If applicable, add screenshots to help explain your problem.
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/usability-issue.md

@@ -0,0 +1,30 @@
+---
+name: Usability issue
+about: Create a report to help us improve ClickHouse
+title: ''
+labels: usability
+assignees: ''
+
+---
+
+(you don't have to strictly follow this form)
+
+**Describe the issue**
+A clear and concise description of what works not as it is supposed to.
+
+**How to reproduce**
+* Which ClickHouse server version to use
+* Which interface to use, if matters
+* Non-default settings, if any
+* `CREATE TABLE` statements for all tables involved
+* Sample data for all these tables, use [clickhouse-obfuscator](https://github.com/ClickHouse/ClickHouse/blob/master/dbms/programs/obfuscator/Obfuscator.cpp#L42-L80) if necessary
+* Queries to run that lead to unexpected result
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Error message and/or stacktrace**
+If applicable, add screenshots to help explain your problem.
+
+**Additional context**
+Add any other context about the problem here.