Merge pull request #3107 from lbudai/lbudai-news-files-2020-jan

missing news files

Author: MrAnno

news/developer-note-3043.md

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+`signal-slot-connector`: a generic event handler interface for syslog-ng modules
+
+* The concept is simple:
+
+There is a SignalSlotConnector which stores Signal - Slot connections 
+Signal : Slot = 1 : N, so multiple slots can be assigned to the same Signal.
+When a Signal is emitted, the connected Slots are executed.
+Signals are string literals and each module can define its own signals.
+
+* Interface/protocol between signals and slots
+
+A macro (SIGNAL) can be used for defining signals as string literals:
+
+```
+SIGNAL(module_name, signal, signal_parameter_type)
+```
+
+The parameter type is for expressing a kind of contract between signals and slots.
+
+usage:
+
+```
+   #define signal_cfg_reloaded SIGNAL(config, reloaded, GlobalConfig)
+
+   the generated literal:
+
+   "config::signal_reloaded(GlobalConfig *)"
+```
+ 
+ emit passes the argument to the slots connected to the emitted signal.
+

news/developer-note-3044.md

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+`http`: define HTTP signals
+
+This changeset defines the Signal interface for HTTP - with one signal at this time.
+
+What's in the changeset?
+
+* List ADT (abstract data type for list implementations) added to lib.
+  * Interface:
+    * append
+    * foreach
+    * is_empty
+    * remove_all
+
+Implement the List ADT in http module with `struct curl_slist` for storing the headers.
+
+* HTTP signal(s):
+Currently only one signal is added, `header_request`.
+
+Note, that the license for `http-signals.h` is *LGPL* .
+

news/feature-3078.md

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+`azure-auth-header`: Azure auth header is a plugin that generates
+authorization header for applications connecting to Azure.
+It can be used as a building block in higher level SCLs.
+Implemented as a `signal-slot` plugin.
+
+<details>
+  <summary>Example config, click to expand!</summary>
+
+```
+@version:3.25
+@include "scl.conf"
+destination d_http {
+  http(
+    url("http://127.0.0.1:8888")
+    method("PUT")
+    user_agent("syslog-ng User Agent")
+    body("${ISODATE} ${MESSAGE}")
+    azure-auth-header(
+      workspace-id("workspace-id")
+      secret("aa1a")
+      method("POST")
+      path("/api/logs")
+      content-type("application/json")
+    )
+  );
+};
+source s_gen {
+  example-msg-generator(num(1) template("Test message\n"));
+};
+log {
+  source(s_gen);
+  destination(d_http);
+};
+```
+</details>

news/other-3086.md

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+`http`: `use-system-cert-store` functionality has been changed
+
+This option was added in order to support monolithic installations
+that ships even libcurl... But later, as it came out, it's not enough.
+What we really need is to do some autodetection regarding ca-file and ca-dir.
+In monolithic installations we enable this by default in the related SCLs.
+

news/other-3092.md

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+`afmongodb`: remove the support of deprecated legacy configurations
+
+