add test file to docker spin up

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

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+version: '3'
+
+services:
+  telegraf:
+      image: glinton/scratch
+      volumes:
+        - ./telegraf.conf:/telegraf.conf
+        - ../../../../telegraf:/telegraf
+        - ./json_a.log:/var/log/test.log
+      entrypoint:
+        - /telegraf
+        - --config
+        - /telegraf.conf

plugins/inputs/reader/dev/json_a.log

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+{
+		"parent": {
+			"child": 3.0,
+			"ignored_child": "hi"
+		},
+		"ignored_null": null,
+		"integer": 4,
+		"list": [3, 4],
+		"ignored_parent": {
+			"another_ignored_null": null,
+			"ignored_string": "hello, world!"
+		},
+		"another_list": [4]
+	}

telegraf.conf

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+
+# Global tags can be specified here in key="value" format.
+[global_tags]
+  # dc = "us-east-1" # will tag all metrics with dc=us-east-1
+  # rack = "1a"
+  ## Environment variables can be used as tags, and throughout the config file
+  # user = "$USER"
+
+
+# Configuration for telegraf agent
+[agent]
+  ## Default data collection interval for all inputs
+  interval = "10s"
+  ## Rounds collection interval to 'interval'
+  ## ie, if interval="10s" then always collect on :00, :10, :20, etc.
+  round_interval = true
+
+  ## Telegraf will send metrics to outputs in batches of at most
+  ## metric_batch_size metrics.
+  ## This controls the size of writes that Telegraf sends to output plugins.
+  metric_batch_size = 1000
+
+  ## For failed writes, telegraf will cache metric_buffer_limit metrics for each
+  ## output, and will flush this buffer on a successful write. Oldest metrics
+  ## are dropped first when this buffer fills.
+  ## This buffer only fills when writes fail to output plugin(s).
+  metric_buffer_limit = 10000
+
+  ## Collection jitter is used to jitter the collection by a random amount.
+  ## Each plugin will sleep for a random time within jitter before collecting.
+  ## This can be used to avoid many plugins querying things like sysfs at the
+  ## same time, which can have a measurable effect on the system.
+  collection_jitter = "0s"
+
+  ## Default flushing interval for all outputs. You shouldn't set this below
+  ## interval. Maximum flush_interval will be flush_interval + flush_jitter
+  flush_interval = "10s"
+  ## Jitter the flush interval by a random amount. This is primarily to avoid
+  ## large write spikes for users running a large number of telegraf instances.
+  ## ie, a jitter of 5s and interval 10s means flushes will happen every 10-15s
+  flush_jitter = "0s"
+
+  ## By default or when set to "0s", precision will be set to the same
+  ## timestamp order as the collection interval, with the maximum being 1s.
+  ##   ie, when interval = "10s", precision will be "1s"
+  ##       when interval = "250ms", precision will be "1ms"
+  ## Precision will NOT be used for service inputs. It is up to each individual
+  ## service input to set the timestamp at the appropriate precision.
+  ## Valid time units are "ns", "us" (or "µs"), "ms", "s".
+  precision = ""
+
+  ## Logging configuration:
+  ## Run telegraf with debug log messages.
+  debug = false
+  ## Run telegraf in quiet mode (error log messages only).
+  quiet = false
+  ## Specify the log file name. The empty string means to log to stderr.
+  logfile = ""
+
+  ## Override default hostname, if empty use os.Hostname()
+  hostname = ""
+  ## If set to true, do no set the "host" tag in the telegraf agent.
+  omit_hostname = false
+
+# # reload and gather from file[s] on telegraf's interval
+[[inputs.reader]]
+# ## These accept standard unix glob matching rules, but with the addition of
+# ## ** as a "super asterisk". ie:
+# ##   /var/log/**.log     -> recursively find all .log files in /var/log
+# ##   /var/log/*/*.log    -> find all .log files with a parent dir in /var/log
+# ##   /var/log/apache.log -> only tail the apache log file
+files = ["/Users/maxu/go/src/github.com/influxdata/telegraf/plugins/inputs/logparser/grok/testdata/**.log"]
+#
+# ## The dataformat to be read from files
+# ## Each data format has its own unique set of configuration options, read
+# ## more about them here:
+# ## https://github.com/influxdata/telegraf/blob/master/docs/DATA_FORMATS_INPUT.md
+data_format = "grok"
+#
+
+patterns = ["%{TEST_LOG_B}","%{TEST_LOG_A}"]
+#
+#   ## Name of the outputted measurement name.
+name_override = "grok_reader"
+#
+#   ## Full path(s) to custom pattern files.
+custom_pattern_files = ["/Users/maxu/go/src/github.com/influxdata/telegraf/plugins/inputs/logparser/grok/testdata/test-patterns"]
+#
+#   ## Custom patterns can also be defined here. Put one pattern per line.
+#   custom_patterns = '''
+#   '''
+#
+#   ## Timezone allows you to provide an override for timestamps that
+#   ## don't already include an offset
+#   ## e.g. 04/06/2016 12:41:45 data one two 5.43µs
+#   ##
+#   ## Default: "" which renders UTC
+#   ## Options are as follows:
+#   ##   1. Local             -- interpret based on machine localtime
+#   ##   2. "Canada/Eastern"  -- Unix TZ values like those found in https://en.wikipedia.org/wiki/List_of_tz_database_time_zones
+#   ##   3. UTC               -- or blank/unspecified, will return timestamp in UTC
+#   timezone = "Canada/Eastern"
+
+