Merging upstream version 1.11.0+dfsg.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

6 files changed, 1115 insertions, 32 deletions

diff --git a/streaming/Makefile.am b/streaming/Makefile.am
new file mode 100644
index 00000000..84048948
--- /dev/null
+++ b/streaming/Makefile.am
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diff --git a/streaming/README.md b/streaming/README.md
new file mode 100644
index 00000000..1f3bd739
--- /dev/null
+++ b/streaming/README.md
@@ -0,0 +1,413 @@
+# Metrics streaming
+
+Each netdata is able to replicate/mirror its database to another netdata, by streaming collected
+metrics, in real-time to it. This is quite different to [data archiving to third party time-series
+databases](../backends).
+
+When a netdata streams metrics to another netdata, the receiving one is able to perform everything
+a netdata performs:
+
+- visualize them with a dashboard
+- run health checks that trigger alarms and send alarm notifications
+- archive metrics to a backend time-series database
+
+The following configurations are supported:
+
+#### netdata without a database or web API (headless collector)
+
+Local netdata (`slave`), **without any database or alarms**, collects metrics and sends them to
+another netdata (`master`).
+
+The user can take the full functionality of the `slave` netdata at
+http://master.ip:19999/host/slave.hostname/. Alarms for the `slave` are served by the `master`.
+
+In this mode the `slave` is just a plain data collector.
+It runs with... **5MB** of RAM (yes, you read correct), spawns all external plugins, but instead
+of maintaining a local database and accepting dashboard requests, it streams all metrics to the
+`master`.
+
+The same `master` can collect data for any number of `slaves`.
+
+#### database replication
+
+Local netdata (`slave`), **with a local database (and possibly alarms)**, collects metrics and
+sends them to another netdata (`master`).
+
+The user can use all the functions **at both** http://slave.ip:19999/ and
+http://master.ip:19999/host/slave.hostname/.
+
+The `slave` and the `master` may have different data retention policies for the same metrics.
+
+Alarms for the `slave` are triggered by **both** the `slave` and the `master` (and actually
+each can have different alarms configurations or have alarms disabled).
+
+#### netdata proxies
+
+Local netdata (`slave`), with or without a database, collects metrics and sends them to another
+netdata (`proxy`), which may or may not maintain a database, which forwards them to another
+netdata (`master`).
+
+Alarms for the slave can be triggered by any of the involved hosts that maintains a database.
+
+Any number of daisy chaining netdata servers are supported, each with or without a database and
+with or without alarms for the `slave` metrics.
+
+#### mix and match with backends
+
+All nodes that maintain a database can also send their data to a backend database.
+This allows quite complex setups.
+
+Example:
+
+1. netdata `A`, `B` do not maintain a database and stream metrics to netdata `C`(live streaming functionality, i.e. this PR)
+2. netdata `C` maintains a database for `A`, `B`, `C` and archives all metrics to `graphite` with 10 second detail (backends functionality)
+3. netdata `C` also streams data for `A`, `B`, `C` to netdata `D`, which also collects data from `E`, `F` and `G` from another DMZ (live streaming functionality, i.e. this PR)
+4. netdata `D` is just a proxy, without a database, that streams all data to a remote site at netdata `H`
+5. netdata `H` maintains a database for `A`, `B`, `C`, `D`, `E`, `F`, `G`, `H` and sends all data to `opentsdb` with 5 seconds detail (backends functionality)
+6. alarms are triggered by `H` for all hosts
+7. users can use all the netdata that maintain a database to view metrics (i.e. at `H` all hosts can be viewed).
+
+#### netdata.conf configuration
+
+These are options that affect the operation of netdata in this area:
+
+```
+[global]
+    memory mode = none | ram | save | map
+```
+
+`[global].memory mode = none` disables the database at this host. This also disables health
+monitoring (there cannot be health monitoring without a database).
+
+```
+[web]
+    mode = none | static-threaded | single-threaded | multi-threaded
+```
+
+`[web].mode = none` disables the API (netdata will not listen to any ports).
+This also disables the registry (there cannot be a registry without an API).
+
+```
+[backend]
+    enabled = yes | no
+    type = graphite | opentsdb
+    destination = IP:PORT ...
+    update every = 10
+```
+
+`[backend]` configures data archiving to a backend (it archives all databases maintained on
+this host).
+
+#### streaming configuration
+
+A new file is introduced: [stream.conf](stream.conf) (to edit it on your system run
+`/etc/netdata/edit-config stream.conf`). This file holds streaming configuration for both the
+sending and the receiving netdata.
+
+API keys are used to authorize the communication of a pair of sending-receiving netdata.
+Once the communication is authorized, the sending netdata can push metrics for any number of hosts.
+
+You can generate an API key with the command `uuidgen`. API keys are just random GUIDs.
+You can use the same API key on all your netdata, or use a different API key for any pair of
+sending-receiving netdata.
+
+##### options for the sending node
+
+This is the section for the sending netdata. On the receiving node, `[stream].enabled` can be `no`.
+If it is `yes`, the receiving node will also stream the metrics to another node (i.e. it will be
+a `proxy`).
+
+```
+[stream]
+    enabled = yes | no
+    destination = IP:PORT ...
+    api key = XXXXXXXXXXX
+```
+
+This is an overview of how these options can be combined:
+
+target | memory<br/>mode | web<br/>mode | stream<br/>enabled | backend | alarms | dashboard
+-------|:-----------:|:---:|:------:|:-------:|:---------:|:----:
+headless collector|`none`|`none`|`yes`|only for `data source = as collected`|not possible|no
+headless proxy|`none`|not `none`|`yes`|only for `data source = as collected`|not possible|no
+proxy with db|not `none`|not `none`|`yes`|possible|possible|yes
+central netdata|not `none`|not `none`|`no`|possible|possible|yes
+
+##### options for the receiving node
+
+`stream.conf` looks like this:
+
+```sh
+# replace API_KEY with your uuidgen generated GUID
+[API_KEY]
+    enabled = yes
+    default history = 3600
+    default memory mode = save
+    health enabled by default = auto
+    allow from = *
+```
+
+You can add many such sections, one for each API key. The above are used as default values for
+all hosts pushed with this API key.
+
+You can also add sections like this:
+
+```sh
+# replace MACHINE_GUID with the slave /var/lib/netdata/registry/netdata.public.unique.id
+[MACHINE_GUID]
+    enabled = yes
+    history = 3600
+    memory mode = save
+    health enabled = yes
+    allow from = *
+```
+
+The above is the receiver configuration of a single host, at the receiver end. `MACHINE_GUID` is
+the unique id the netdata generating the metrics (i.e. the netdata that originally collects
+them `/var/lib/netdata/registry/netdata.unique.id`). So, metrics for netdata `A` that pass through
+any number of other netdata, will have the same `MACHINE_GUID`.
+
+####### allow from
+
+`allow from` settings are [netdata simple patterns](../libnetdata/simple_pattern): string matches
+that use `*` as wildcard (any number of times) and a `!` prefix for a negative match.
+So: `allow from = !10.1.2.3 10.*` will allow all IPs in `10.*` except `10.1.2.3`. The order is
+important: left to right, the first positive or negative match is used.
+
+`allow from` is available in netdata v1.9+
+
+#### tracing
+
+When a `slave` is trying to push metrics to a `master` or `proxy`, it logs entries like these:
+
+```
+2017-02-25 01:57:44: netdata: ERROR: Failed to connect to '10.11.12.1', port '19999' (errno 111, Connection refused)
+2017-02-25 01:57:44: netdata: ERROR: STREAM costa-pc [send to 10.11.12.1:19999]: failed to connect
+2017-02-25 01:58:04: netdata: INFO : STREAM costa-pc [send to 10.11.12.1:19999]: initializing communication...
+2017-02-25 01:58:04: netdata: INFO : STREAM costa-pc [send to 10.11.12.1:19999]: waiting response from remote netdata...
+2017-02-25 01:58:14: netdata: INFO : STREAM costa-pc [send to 10.11.12.1:19999]: established communication - sending metrics...
+2017-02-25 01:58:14: netdata: ERROR: STREAM costa-pc [send]: discarding 1900 bytes of metrics already in the buffer.
+2017-02-25 01:58:14: netdata: INFO : STREAM costa-pc [send]: ready - sending metrics...
+```
+
+The receiving end (`proxy` or `master`) logs entries like these:
+
+```
+2017-02-25 01:58:04: netdata: INFO : STREAM [receive from [10.11.12.11]:33554]: new client connection.
+2017-02-25 01:58:04: netdata: INFO : STREAM costa-pc [10.11.12.11]:33554: receive thread created (task id 7698)
+2017-02-25 01:58:14: netdata: INFO : Host 'costa-pc' with guid '12345678-b5a6-11e6-8a50-00508db7e9c9' initialized, os: linux, update every: 1, memory mode: ram, history entries: 3600, streaming: disabled, health: enabled, cache_dir: '/var/cache/netdata/12345678-b5a6-11e6-8a50-00508db7e9c9', varlib_dir: '/var/lib/netdata/12345678-b5a6-11e6-8a50-00508db7e9c9', health_log: '/var/lib/netdata/12345678-b5a6-11e6-8a50-00508db7e9c9/health/health-log.db', alarms default handler: '/usr/libexec/netdata/plugins.d/alarm-notify.sh', alarms default recipient: 'root'
+2017-02-25 01:58:14: netdata: INFO : STREAM costa-pc [receive from [10.11.12.11]:33554]: initializing communication...
+2017-02-25 01:58:14: netdata: INFO : STREAM costa-pc [receive from [10.11.12.11]:33554]: receiving metrics...
+```
+
+For netdata v1.9+, streaming can also be monitored via `access.log`.
+
+
+#### Viewing remote host dashboards, using mirrored databases
+
+On any receiving netdata, that maintains remote databases and has its web server enabled,
+`my-netdata` menu will include a list of the mirrored databases.
+
+![image](https://cloud.githubusercontent.com/assets/2662304/24080824/24cd2d3c-0caf-11e7-909d-a8dd1dbb95d7.png)
+
+Selecting any of these, the server will offer a dashboard using the mirrored metrics.
+
+
+## Monitoring ephemeral nodes
+
+Auto-scaling is probably the most trendy service deployment strategy these days.
+
+Auto-scaling detects the need for additional resources and boots VMs on demand, based on a template. Soon after they start running the applications, a load balancer starts distributing traffic to them, allowing the service to grow horizontally to the scale needed to handle the load. When demands falls, auto-scaling starts shutting down VMs that are no longer needed.
+
+<p align="center">
+<img src="https://cloud.githubusercontent.com/assets/2662304/23627426/65a9074a-02b9-11e7-9664-cd8f258a00af.png"/>
+</p>
+
+What a fantastic feature for controlling infrastructure costs! Pay only for what you need for the time you need it!
+
+In auto-scaling, all servers are ephemeral, they live for just a few hours. Every VM is a brand new instance of the application, that was automatically created based on a template.
+
+So, how can we monitor them? How can we be sure that everything is working as expected on all of them?
+
+### The netdata way
+
+We recently made a significant improvement at the core of netdata to support monitoring such setups.
+
+Following the netdata way of monitoring, we wanted:
+
+1. **real-time performance monitoring**, collecting **_thousands of metrics per server per second_**, visualized in interactive, automatically created dashboards.
+2. **real-time alarms**, for all nodes.
+3. **zero configuration**, all ephemeral servers should have exactly the same configuration, and nothing should be configured at any system for each of the ephemeral nodes. We shouldn't care if 10 or 100 servers are spawned to handle the load.
+4. **self-cleanup**, so that nothing needs to be done for cleaning up the monitoring infrastructure from the hundreds of nodes that may have been monitored through time.
+
+#### How it works
+
+All monitoring solutions, including netdata, work like this:
+
+1. `collect metrics`, from the system and the running applications
+2. `store metrics`, in a time-series database
+3. `examine metrics` periodically, for triggering alarms and sending alarm notifications
+4. `visualize metrics`, so that users can see what exactly is happening
+
+netdata used to be self-contained, so that all these functions were handled entirely by each server. The changes we made, allow each netdata to be configured independently for each function. So, each netdata can now act as:
+
+- a `self contained system`, much like it used to be.
+- a `data collector`, that collects metrics from a host and pushes them to another netdata (with or without a local database and alarms).
+- a `proxy`, that receives metrics from other hosts and pushes them immediately to other netdata servers. netdata proxies can also be `store and forward proxies` meaning that they are able to maintain a local database for all metrics passing through them (with or without alarms).
+- a `time-series database` node, where data are kept, alarms are run and queries are served to visualise the metrics.
+
+### Configuring an auto-scaling setup
+
+<p align="center">
+<img src="https://cloud.githubusercontent.com/assets/2662304/23627468/96daf7ba-02b9-11e7-95ac-1f767dd8dab8.png"/>
+</p>
+
+You need a netdata `master`. This node should not be ephemeral. It will be the node where all ephemeral nodes (let's call them `slaves`) will be sending their metrics.
+
+The master will need to authorize the slaves for accepting their metrics. This is done with an API key.
+
+#### API keys
+
+API keys are just random GUIDs. Use the Linux command `uuidgen` to generate one. You can use the same API key for all your `slaves`, or you can configure one API for each of them. This is entirely your decision.
+
+We suggest to use the same API key for each ephemeral node template you have, so that all replicas of the same ephemeral node will have exactly the same configuration.
+
+I will use this API_KEY: `11111111-2222-3333-4444-555555555555`. Replace it with your own.
+
+#### Configuring the `master`
+
+On the master, edit `/etc/netdata/stream.conf` (to edit it on your system run `/etc/netdata/edit-config stream.conf`) and set these:
+
+```bash
+[11111111-2222-3333-4444-555555555555]
+	# enable/disable this API key
+    enabled = yes
+    
+    # one hour of data for each of the slaves
+    default history = 3600
+    
+    # do not save slave metrics on disk
+    default memory = ram
+    
+    # alarms checks, only while the slave is connected
+    health enabled by default = auto
+```
+*`stream.conf` on master, to enable receiving metrics from slaves using the API key.*
+
+If you used many API keys, you can add one such section for each API key.
+
+When done, restart netdata on the `master` node. It is now ready to receive metrics.
+
+#### Configuring the `slaves`
+
+On each of the slaves, edit `/etc/netdata/stream.conf` (to edit it on your system run `/etc/netdata/edit-config stream.conf`) and set these:
+
+```bash
+[stream]
+    # stream metrics to another netdata
+    enabled = yes
+    
+    # the IP and PORT of the master
+    destination = 10.11.12.13:19999
+	
+	# the API key to use
+    api key = 11111111-2222-3333-4444-555555555555
+```
+*`stream.conf` on slaves, to enable pushing metrics to master at `10.11.12.13:19999`.*
+
+Using just the above configuration, the `slaves` will be pushing their metrics to the `master` netdata, but they will still maintain a local database of the metrics and run health checks. To disable them, edit `/etc/netdata/netdata.conf` and set:
+
+```bash
+[global]
+    # disable the local database
+	memory mode = none
+
+[health]
+    # disable health checks
+    enabled = no
+```
+*`netdata.conf` configuration on slaves, to disable the local database and health checks.*
+
+Keep in mind that setting `memory mode = none` will also force `[health].enabled = no` (health checks require access to a local database). But you can keep the database and disable health checks if you need to. You are however sending all the metrics to the master server, which can handle the health checking (`[health].enabled = yes`)
+
+#### netdata unique id
+
+The file `/var/lib/netdata/registry/netdata.public.unique.id` contains a random GUID that **uniquely identifies each netdata**. This file is automatically generated, by netdata, the first time it is started and remains unaltaired forever.
+
+> If you are building an image to be used for automated provisioning of autoscaled VMs, it important to delete that file from the image, so that each instance of your image will generate its own.
+
+#### Troubleshooting metrics streaming
+
+Both the sender and the receiver of metrics log information at `/var/log/netdata/error.log`.
+
+
+On both master and slave do this:
+
+```
+tail -f /var/log/netdata/error.log | grep STREAM
+```
+
+If the slave manages to connect to the master you will see something like (on the master):
+
+```
+2017-03-09 09:38:52: netdata: INFO : STREAM [receive from [10.11.12.86]:38564]: new client connection.
+2017-03-09 09:38:52: netdata: INFO : STREAM xxx [10.11.12.86]:38564: receive thread created (task id 27721)
+2017-03-09 09:38:52: netdata: INFO : STREAM xxx [receive from [10.11.12.86]:38564]: client willing to stream metrics for host 'xxx' with machine_guid '1234567-1976-11e6-ae19-7cdd9077342a': update every = 1, history = 3600, memory mode = ram, health auto
+2017-03-09 09:38:52: netdata: INFO : STREAM xxx [receive from [10.11.12.86]:38564]: initializing communication...
+2017-03-09 09:38:52: netdata: INFO : STREAM xxx [receive from [10.11.12.86]:38564]: receiving metrics...
+```
+
+and something like this on the slave:
+
+```
+2017-03-09 09:38:28: netdata: INFO : STREAM xxx [send to box:19999]: connecting...
+2017-03-09 09:38:28: netdata: INFO : STREAM xxx [send to box:19999]: initializing communication...
+2017-03-09 09:38:28: netdata: INFO : STREAM xxx [send to box:19999]: waiting response from remote netdata...
+2017-03-09 09:38:28: netdata: INFO : STREAM xxx [send to box:19999]: established communication - sending metrics...
+```
+
+### Archiving to a time-series database
+
+The `master` netdata node can also archive metrics, for all `slaves`, to a time-series database. At the time of this writing, netdata supports:
+
+- graphite
+- opentsdb
+- prometheus
+- json document DBs
+- all the compatibles to the above (e.g. kairosdb, influxdb, etc)
+
+Check the netdata [backends documentation](../backends) for configuring this.
+
+This is how such a solution will work:
+
+<p align="center">
+<img src="https://cloud.githubusercontent.com/assets/2662304/23627295/e3569adc-02b8-11e7-9d55-4014bf98c1b3.png"/>
+</p>
+
+### An advanced setup
+
+netdata also supports `proxies` with and without a local database, and data retention can be different between all nodes.
+
+This means a setup like the following is also possible:
+
+<p align="center">
+<img src="https://cloud.githubusercontent.com/assets/2662304/23629551/bb1fd9c2-02c0-11e7-90f5-cab5a3ed4c53.png"/>
+</p>
+
+
+## proxies
+
+A proxy is a netdata that is receiving metrics from a netdata, and streams them to another netdata.
+
+netdata proxies may or may not maintain a database for the metrics passing through them.
+When they maintain a database, they can also run health checks (alarms and notifications)
+for the remote host that is streaming the metrics.
+
+To configure a proxy, configure it as a receiving and a sending netdata at the same time,
+using [stream.conf](stream.conf).
+
+The sending side of a netdata proxy, connects and disconnects to the final destination of the
+metrics, following the same pattern of the receiving side.
+
+For a practical example see [Monitoring ephemeral nodes](#monitoring-ephemeral-nodes).
+
diff --git a/src/rrdpush.c b/streaming/rrdpush.c
index 8f71c6d4..df1a2177 100644
--- a/src/rrdpush.c
+++ b/streaming/rrdpush.c
@@ -1,4 +1,6 @@
-#include "common.h"
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "rrdpush.h"
 
 /*
  * rrdpush
@@ -30,14 +32,46 @@ typedef enum {
     RRDPUSH_MULTIPLE_CONNECTIONS_DENY_NEW
 } RRDPUSH_MULTIPLE_CONNECTIONS_STRATEGY;
 
-int default_rrdpush_enabled = 0;
+static struct config stream_config = {
+        .sections = NULL,
+        .mutex = NETDATA_MUTEX_INITIALIZER,
+        .index = {
+                .avl_tree = {
+                        .root = NULL,
+                        .compar = appconfig_section_compare
+                },
+                .rwlock = AVL_LOCK_INITIALIZER
+        }
+};
+
+unsigned int default_rrdpush_enabled = 0;
 char *default_rrdpush_destination = NULL;
 char *default_rrdpush_api_key = NULL;
+char *default_rrdpush_send_charts_matching = NULL;
+
+static void load_stream_conf() {
+    errno = 0;
+    char *filename = strdupz_path_subpath(netdata_configured_user_config_dir, "stream.conf");
+    if(!appconfig_load(&stream_config, filename, 0)) {
+        info("CONFIG: cannot load user config '%s'. Will try stock config.", filename);
+        freez(filename);
+
+        filename = strdupz_path_subpath(netdata_configured_stock_config_dir, "stream.conf");
+        if(!appconfig_load(&stream_config, filename, 0))
+            info("CONFIG: cannot load stock config '%s'. Running with internal defaults.", filename);
+    }
+    freez(filename);
+}
 
 int rrdpush_init() {
-    default_rrdpush_enabled     = appconfig_get_boolean(&stream_config, CONFIG_SECTION_STREAM, "enabled", default_rrdpush_enabled);
+    // --------------------------------------------------------------------
+    // load stream.conf
+    load_stream_conf();
+
+    default_rrdpush_enabled     = (unsigned int)appconfig_get_boolean(&stream_config, CONFIG_SECTION_STREAM, "enabled", default_rrdpush_enabled);
     default_rrdpush_destination = appconfig_get(&stream_config, CONFIG_SECTION_STREAM, "destination", "");
     default_rrdpush_api_key     = appconfig_get(&stream_config, CONFIG_SECTION_STREAM, "api key", "");
+    default_rrdpush_send_charts_matching      = appconfig_get(&stream_config, CONFIG_SECTION_STREAM, "send charts matching", "*");
     rrdhost_free_orphan_time    = config_get_number(CONFIG_SECTION_GLOBAL, "cleanup orphan hosts after seconds", rrdhost_free_orphan_time);
 
     if(default_rrdpush_enabled && (!default_rrdpush_destination || !*default_rrdpush_destination || !default_rrdpush_api_key || !*default_rrdpush_api_key)) {
@@ -67,17 +101,44 @@ unsigned int remote_clock_resync_iterations = 60;
 #define rrdpush_buffer_lock(host) netdata_mutex_lock(&((host)->rrdpush_sender_buffer_mutex))
 #define rrdpush_buffer_unlock(host) netdata_mutex_unlock(&((host)->rrdpush_sender_buffer_mutex))
 
+static inline int should_send_chart_matching(RRDSET *st) {
+    if(unlikely(!rrdset_flag_check(st, RRDSET_FLAG_ENABLED))) {
+        rrdset_flag_clear(st, RRDSET_FLAG_UPSTREAM_SEND);
+        rrdset_flag_set(st, RRDSET_FLAG_UPSTREAM_IGNORE);
+    }
+    else if(!rrdset_flag_check(st, RRDSET_FLAG_UPSTREAM_SEND|RRDSET_FLAG_UPSTREAM_IGNORE)) {
+        RRDHOST *host = st->rrdhost;
+
+        if(simple_pattern_matches(host->rrdpush_send_charts_matching, st->id) ||
+            simple_pattern_matches(host->rrdpush_send_charts_matching, st->name)) {
+            rrdset_flag_clear(st, RRDSET_FLAG_UPSTREAM_IGNORE);
+            rrdset_flag_set(st, RRDSET_FLAG_UPSTREAM_SEND);
+        }
+        else {
+            rrdset_flag_clear(st, RRDSET_FLAG_UPSTREAM_SEND);
+            rrdset_flag_set(st, RRDSET_FLAG_UPSTREAM_IGNORE);
+        }
+    }
+
+    return(rrdset_flag_check(st, RRDSET_FLAG_UPSTREAM_SEND));
+}
+
 // checks if the current chart definition has been sent
 static inline int need_to_send_chart_definition(RRDSET *st) {
     rrdset_check_rdlock(st);
 
-    if(unlikely(!(rrdset_flag_check(st, RRDSET_FLAG_EXPOSED_UPSTREAM))))
+    if(unlikely(!(rrdset_flag_check(st, RRDSET_FLAG_UPSTREAM_EXPOSED))))
         return 1;
 
     RRDDIM *rd;
-    rrddim_foreach_read(rd, st)
-        if(unlikely(!rd->exposed))
+    rrddim_foreach_read(rd, st) {
+        if(unlikely(!rd->exposed)) {
+            #ifdef NETDATA_INTERNAL_CHECKS
+            info("host '%s', chart '%s', dimension '%s' flag 'exposed' triggered chart refresh to upstream", st->rrdhost->hostname, st->id, rd->id);
+            #endif
             return 1;
+        }
+    }
 
     return 0;
 }
@@ -86,14 +147,27 @@ static inline int need_to_send_chart_definition(RRDSET *st) {
 static inline void rrdpush_send_chart_definition_nolock(RRDSET *st) {
     RRDHOST *host = st->rrdhost;
 
-    rrdset_flag_set(st, RRDSET_FLAG_EXPOSED_UPSTREAM);
+    rrdset_flag_set(st, RRDSET_FLAG_UPSTREAM_EXPOSED);
+
+    // properly set the name for the remote end to parse it
+    char *name = "";
+    if(unlikely(strcmp(st->id, st->name))) {
+        // they differ
+        name = strchr(st->name, '.');
+        if(name)
+            name++;
+        else
+            name = "";
+    }
+
+    // info("CHART '%s' '%s'", st->id, name);
 
     // send the chart
     buffer_sprintf(
             host->rrdpush_sender_buffer
             , "CHART \"%s\" \"%s\" \"%s\" \"%s\" \"%s\" \"%s\" \"%s\" %ld %d \"%s %s %s %s\" \"%s\" \"%s\"\n"
             , st->id
-            , st->name
+            , name
             , st->title
             , st->units
             , st->family
@@ -129,7 +203,7 @@ static inline void rrdpush_send_chart_definition_nolock(RRDSET *st) {
     // send the chart local custom variables
     RRDSETVAR *rs;
     for(rs = st->variables; rs ;rs = rs->next) {
-        if(unlikely(rs->options && RRDVAR_OPTION_ALLOCATED)) {
+        if(unlikely(rs->type == RRDVAR_TYPE_CALCULATED && rs->options & RRDVAR_OPTION_CUSTOM_CHART_VAR)) {
             calculated_number *value = (calculated_number *) rs->value;
 
             buffer_sprintf(
@@ -147,7 +221,7 @@ static inline void rrdpush_send_chart_definition_nolock(RRDSET *st) {
 // sends the current chart dimensions
 static inline void rrdpush_send_chart_metrics_nolock(RRDSET *st) {
     RRDHOST *host = st->rrdhost;
-    buffer_sprintf(host->rrdpush_sender_buffer, "BEGIN \"%s\" %llu\n", st->id, (st->upstream_resync_time > st->last_collected_time.tv_sec)?st->usec_since_last_update:0);
+    buffer_sprintf(host->rrdpush_sender_buffer, "BEGIN \"%s\" %llu\n", st->id, (st->last_collected_time.tv_sec > st->upstream_resync_time)?st->usec_since_last_update:0);
 
     RRDDIM *rd;
     rrddim_foreach_read(rd, st) {
@@ -164,9 +238,12 @@ static inline void rrdpush_send_chart_metrics_nolock(RRDSET *st) {
 
 static void rrdpush_sender_thread_spawn(RRDHOST *host);
 
-void rrdset_push_chart_definition(RRDSET *st) {
+void rrdset_push_chart_definition_now(RRDSET *st) {
     RRDHOST *host = st->rrdhost;
 
+    if(unlikely(!host->rrdpush_send_enabled || !should_send_chart_matching(st)))
+        return;
+
     rrdset_rdlock(st);
     rrdpush_buffer_lock(host);
     rrdpush_send_chart_definition_nolock(st);
@@ -175,11 +252,11 @@ void rrdset_push_chart_definition(RRDSET *st) {
 }
 
 void rrdset_done_push(RRDSET *st) {
-    RRDHOST *host = st->rrdhost;
-
-    if(unlikely(!rrdset_flag_check(st, RRDSET_FLAG_ENABLED)))
+    if(unlikely(!should_send_chart_matching(st)))
         return;
 
+    RRDHOST *host = st->rrdhost;
+
     rrdpush_buffer_lock(host);
 
     if(unlikely(host->rrdpush_send_enabled && !host->rrdpush_sender_spawn))
@@ -239,7 +316,7 @@ static int rrdpush_sender_thread_custom_host_variables_callback(void *rrdvar_ptr
     RRDVAR *rv = (RRDVAR *)rrdvar_ptr;
     RRDHOST *host = (RRDHOST *)host_ptr;
 
-    if(unlikely(rv->type == RRDVAR_TYPE_CALCULATED_ALLOCATED)) {
+    if(unlikely(rv->options & RRDVAR_OPTION_CUSTOM_HOST_VAR && rv->type == RRDVAR_TYPE_CALCULATED)) {
         rrdpush_sender_add_host_variable_to_buffer_nolock(host, rv);
 
         // return 1, so that the traversal will return the number of variables sent
@@ -252,6 +329,8 @@ static int rrdpush_sender_thread_custom_host_variables_callback(void *rrdvar_ptr
 
 static void rrdpush_sender_thread_send_custom_host_variables(RRDHOST *host) {
     int ret = rrdvar_callback_for_all_host_variables(host, rrdpush_sender_thread_custom_host_variables_callback, host);
+    (void)ret;
+
     debug(D_STREAM, "RRDVAR sent %d VARIABLES", ret);
 }
 
@@ -262,7 +341,7 @@ static void rrdpush_sender_thread_reset_all_charts(RRDHOST *host) {
 
     RRDSET *st;
     rrdset_foreach_read(st, host) {
-        rrdset_flag_clear(st, RRDSET_FLAG_EXPOSED_UPSTREAM);
+        rrdset_flag_clear(st, RRDSET_FLAG_UPSTREAM_EXPOSED);
 
         st->upstream_resync_time = 0;
 
@@ -475,6 +554,7 @@ void *rrdpush_sender_thread(void *ptr) {
     size_t reconnects_counter = 0;
     size_t sent_bytes = 0;
     size_t sent_bytes_on_this_connection = 0;
+    size_t send_attempts = 0;
 
 
     time_t last_sent_t = 0;
@@ -494,6 +574,8 @@ void *rrdpush_sender_thread(void *ptr) {
 
             // if we don't have socket open, lets wait a bit
             if(unlikely(host->rrdpush_sender_socket == -1)) {
+                send_attempts = 0;
+
                 if(not_connected_loops == 0 && sent_bytes_on_this_connection > 0) {
                     // fast re-connection on first disconnect
                     sleep_usec(USEC_PER_MS * 500); // milliseconds
@@ -509,6 +591,9 @@ void *rrdpush_sender_thread(void *ptr) {
                     // reset the buffer, to properly send charts and metrics
                     rrdpush_sender_thread_data_flush(host);
 
+                    // send from the beginning
+                    begin = 0;
+
                     // make sure the next reconnection will be immediate
                     not_connected_loops = 0;
 
@@ -530,7 +615,7 @@ void *rrdpush_sender_thread(void *ptr) {
                 continue;
             }
             else if(unlikely(now_monotonic_sec() - last_sent_t > timeout)) {
-                error("STREAM %s [send to %s]: could not send metrics for %d seconds - closing connection - we have sent %zu bytes on this connection.", host->hostname, connected_to, timeout, sent_bytes_on_this_connection);
+                error("STREAM %s [send to %s]: could not send metrics for %d seconds - closing connection - we have sent %zu bytes on this connection via %zu send attempts.", host->hostname, connected_to, timeout, sent_bytes_on_this_connection, send_attempts);
                 rrdpush_sender_thread_close_socket(host);
             }
 
@@ -544,6 +629,7 @@ void *rrdpush_sender_thread(void *ptr) {
                 debug(D_STREAM, "STREAM: Requesting data output on streaming socket %d...", ofd->fd);
                 ofd->events = POLLOUT;
                 fdmax = 2;
+                send_attempts++;
             }
             else {
                 debug(D_STREAM, "STREAM: Not requesting data output on streaming socket %d (nothing to send now)...", ofd->fd);
@@ -743,6 +829,7 @@ static int rrdpush_receive(int fd
     int rrdpush_enabled = default_rrdpush_enabled;
     char *rrdpush_destination = default_rrdpush_destination;
     char *rrdpush_api_key = default_rrdpush_api_key;
+    char *rrdpush_send_charts_matching = default_rrdpush_send_charts_matching;
     time_t alarms_delay = 60;
     RRDPUSH_MULTIPLE_CONNECTIONS_STRATEGY rrdpush_multiple_connections_strategy = RRDPUSH_MULTIPLE_CONNECTIONS_ALLOW;
 
@@ -774,6 +861,9 @@ static int rrdpush_receive(int fd
     rrdpush_multiple_connections_strategy = get_multiple_connections_strategy(&stream_config, key, "multiple connections", rrdpush_multiple_connections_strategy);
     rrdpush_multiple_connections_strategy = get_multiple_connections_strategy(&stream_config, machine_guid, "multiple connections", rrdpush_multiple_connections_strategy);
 
+    rrdpush_send_charts_matching = appconfig_get(&stream_config, key, "default proxy send charts matching", rrdpush_send_charts_matching);
+    rrdpush_send_charts_matching = appconfig_get(&stream_config, machine_guid, "proxy send charts matching", rrdpush_send_charts_matching);
+
     tags = appconfig_set_default(&stream_config, machine_guid, "host tags", (tags)?tags:"");
     if(tags && !*tags) tags = NULL;
 
@@ -792,10 +882,11 @@ static int rrdpush_receive(int fd
                 , update_every
                 , history
                 , mode
-                , (health_enabled != CONFIG_BOOLEAN_NO)
-                , (rrdpush_enabled && rrdpush_destination && *rrdpush_destination && rrdpush_api_key && *rrdpush_api_key)
+                , (unsigned int)(health_enabled != CONFIG_BOOLEAN_NO)
+                , (unsigned int)(rrdpush_enabled && rrdpush_destination && *rrdpush_destination && rrdpush_api_key && *rrdpush_api_key)
                 , rrdpush_destination
                 , rrdpush_api_key
+                , rrdpush_send_charts_matching
         );
 
     if(!host) {
@@ -1005,6 +1096,14 @@ int rrdpush_receiver_permission_denied(struct web_client *w) {
     return 401;
 }
 
+int rrdpush_receiver_too_busy_now(struct web_client *w) {
+    // we always respond with the same message and error code
+    // to prevent an attacker from gaining info about the error
+    buffer_flush(w->response.data);
+    buffer_sprintf(w->response.data, "The server is too busy now to accept this request. Try later.");
+    return 503;
+}
+
 int rrdpush_receiver_thread_spawn(RRDHOST *host, struct web_client *w, char *url) {
     (void)host;
 
@@ -1110,6 +1209,26 @@ int rrdpush_receiver_thread_spawn(RRDHOST *host, struct web_client *w, char *url
         }
     }
 
+    if(unlikely(web_client_streaming_rate_t > 0)) {
+        static netdata_mutex_t stream_rate_mutex = NETDATA_MUTEX_INITIALIZER;
+        static volatile time_t last_stream_accepted_t = 0;
+
+        netdata_mutex_lock(&stream_rate_mutex);
+        time_t now = now_realtime_sec();
+
+        if(unlikely(last_stream_accepted_t == 0))
+            last_stream_accepted_t = now;
+
+        if(now - last_stream_accepted_t < web_client_streaming_rate_t) {
+            netdata_mutex_unlock(&stream_rate_mutex);
+            error("STREAM [receive from [%s]:%s]: too busy to accept new streaming request. Will be allowed in %ld secs.", w->client_ip, w->client_port, (long)(web_client_streaming_rate_t - (now - last_stream_accepted_t)));
+            return rrdpush_receiver_too_busy_now(w);
+        }
+
+        last_stream_accepted_t = now;
+        netdata_mutex_unlock(&stream_rate_mutex);
+    }
+
     struct rrdpush_thread *rpt = callocz(1, sizeof(struct rrdpush_thread));
     rpt->fd                = w->ifd;
     rpt->key               = strdupz(key);
diff --git a/src/rrdpush.h b/streaming/rrdpush.h
index bf3d9435..7bf3db93 100644
--- a/src/rrdpush.h
+++ b/streaming/rrdpush.h
@@ -1,14 +1,20 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 #ifndef NETDATA_RRDPUSH_H
-#define NETDATA_RRDPUSH_H
+#define NETDATA_RRDPUSH_H 1
+
+#include "web/server/web_client.h"
+#include "daemon/common.h"
 
-extern int default_rrdpush_enabled;
+extern unsigned int default_rrdpush_enabled;
 extern char *default_rrdpush_destination;
 extern char *default_rrdpush_api_key;
+extern char *default_rrdpush_send_charts_matching;
 extern unsigned int remote_clock_resync_iterations;
 
 extern int rrdpush_init();
 extern void rrdset_done_push(RRDSET *st);
-extern void rrdset_push_chart_definition(RRDSET *st);
+extern void rrdset_push_chart_definition_now(RRDSET *st);
 extern void *rrdpush_sender_thread(void *ptr);
 
 extern int rrdpush_receiver_thread_spawn(RRDHOST *host, struct web_client *w, char *url);
diff --git a/conf.d/stream.conf b/streaming/stream.conf
index d0c9a8b1..493eba37 100644
--- a/conf.d/stream.conf
+++ b/streaming/stream.conf
@@ -39,17 +39,25 @@
     # If the destination line above does not specify a port, use this
     default port = 19999
 
+    # filter the charts to be streamed
+    # netdata SIMPLE PATTERN:
+    # - space separated list of patterns (use \ to include spaces in patterns)
+    # - use * as wildcard, any number of times within each pattern
+    # - prefix a pattern with ! for a negative match (ie not stream the charts it matches)
+    # - the order of patterns is important (left to right)
+    # To send all except a few, use: !this !that *   (ie append a wildcard pattern)
+    send charts matching = *
+
     # The buffer to use for sending metrics.
-    # 1MB is good for 10-20 seconds of data, so increase this
-    # if you expect latencies.
+    # 1MB is good for 10-20 seconds of data, so increase this if you expect latencies.
+    # The buffer is flushed on reconnects (this will not prevent gaps at the charts).
     buffer size bytes = 1048576
 
     # If the connection fails, or it disconnects,
     # retry after that many seconds.
     reconnect delay seconds = 5
 
-    # Attempt to sync the clock the of the master with the clock of the
-    # slave for that many iterations, when starting.
+    # Sync the clock of the charts for that many iterations, when starting.
     initial clock resync iterations = 60
 
 
@@ -62,8 +70,9 @@
 #    netdata searches for options in this order:
 #
 #    a) master netdata settings (netdata.conf)
-#    b) [API_KEY] section       (below, settings for the API key)
-#    c) [MACHINE_GUID] section  (below, settings for each machine)
+#    b) [stream] section        (above)
+#    c) [API_KEY] section       (below, settings for the API key)
+#    d) [MACHINE_GUID] section  (below, settings for each machine)
 #
 #    You can combine the above (the more specific setting will be used).
 
@@ -95,7 +104,7 @@
     # If you don't set it here, the memory mode of netdata.conf will be used.
     # Valid modes:
     #    save    save on exit, load on start
-    #    map     like swap (continuously syncing to disks)
+    #    map     like swap (continuously syncing to disks - you need SSD)
     #    ram     keep it in RAM, don't touch the disk
     #    none    no database at all (use this on headless proxies)
     default memory mode = ram
@@ -106,7 +115,7 @@
     #    no      do not enable alarms
     #    auto    enable alarms, only when the sending netdata is connected
     # You can also set it per host, below.
-    # The default is the same as to netdata.conf
+    # The default is taken from [health].enabled of netdata.conf
     health enabled by default = auto
 
     # postpone alarms for a short period after the sender is connected
@@ -120,15 +129,16 @@
     multiple connections = allow
 
     # need to route metrics differently? set these.
-    # the defaults are the ones at the [stream] section
+    # the defaults are the ones at the [stream] section (above)
     #default proxy enabled = yes | no
     #default proxy destination = IP:PORT IP:PORT ...
     #default proxy api key = API_KEY
+    #default proxy send charts matching = *
 
 
 # -----------------------------------------------------------------------------
 # 3. PER SENDING HOST SETTINGS, ON MASTER NETDATA
-#    THIS IS OPTIONAL - YOU DON'T NEED IT
+#    THIS IS OPTIONAL - YOU DON'T HAVE TO CONFIGURE IT
 
 # This section exists to give you finer control of the master settings for each
 # slave host, when the same API key is used by many netdata slaves / proxies.
@@ -174,6 +184,8 @@
     multiple connections = allow
 
     # need to route metrics differently?
+    # the defaults are the ones at the [API KEY] section
     #proxy enabled = yes | no
     #proxy destination = IP:PORT IP:PORT ...
     #proxy api key = API_KEY
+    #proxy send charts matching = *