Add ClickHouse input plugin (#6441)

plugins/inputs/clickhouse/dev/dhparam.pem

@@ -0,0 +1,13 @@
+-----BEGIN DH PARAMETERS-----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=
+-----END DH PARAMETERS-----

plugins/inputs/clickhouse/dev/docker-compose.yml

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+version: '3'
+
+services:
+  clickhouse:
+    image: yandex/clickhouse-server:latest
+    volumes:
+      - ./dhparam.pem:/etc/clickhouse-server/dhparam.pem
+      - ./tls_settings.xml:/etc/clickhouse-server/config.d/00-tls_settings.xml
+      - ../../../../testutil/pki/serverkey.pem:/etc/clickhouse-server/server.key
+      - ../../../../testutil/pki/servercert.pem:/etc/clickhouse-server/server.crt
+    restart: always
+    ports:
+      - 8123:8123
+      - 8443:8443
+      - 9000:9000
+      - 9009:9009

plugins/inputs/clickhouse/dev/telegraf.conf

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+### ClickHouse input plugin
+
+[[inputs.clickhouse]]
+  timeout         = 2
+  user            = "default"
+  servers         = ["http://127.0.0.1:8123"]
+  auto_discovery  = true
+  cluster_include = []
+  cluster_exclude = ["test_shard_localhost"]
+
+[[outputs.file]]
+  files = ["stdout"]

plugins/inputs/clickhouse/dev/telegraf_ssl.conf

@@ -0,0 +1,16 @@
+### ClickHouse input plugin
+
+[[inputs.clickhouse]]
+  timeout         = 2
+  user            = "default"
+  servers         = ["https://127.0.0.1:8443"]
+  auto_discovery  = true
+  cluster_include = []
+  cluster_exclude = ["test_shard_localhost"]
+  insecure_skip_verify = false
+  tls_cert = "./testutil/pki/clientcert.pem"
+  tls_key = "./testutil/pki/clientkey.pem"
+  tls_ca = "./testutil/pki/cacert.pem"
+
+[[outputs.file]]
+  files = ["stdout"]

plugins/inputs/clickhouse/dev/tls_settings.xml

@@ -0,0 +1,4 @@
+<yandex>
+  <https_port>8443</https_port>
+  <tcp_port_secure>9440</tcp_port_secure>
+</yandex>