batch telegraf data after disconnect leaves holes in continuous query tables

[2clarkd]

Steps to reproduce:
List the minimal actions needed to reproduce the behavior.

1. setup telegraf on host to send data
   [agent]
   interval = "60s"
   round_interval = true
   metric_batch_size = 1000 // allow batched data
   metric_buffer_limit = 10000 // allow sufficient data aggregation over disconnect period
   ...

2. setup second host with influx and continuous query
   DROP CONTINUOUS QUERY "cq.starts" ON "app";
   CREATE CONTINUOUS QUERY "cq.starts" ON "app"
   BEGIN
   SELECT
   non_negative_difference(max(global_starts))
   as starts,
   INTO "app"."one-year"."summary.starts"
   FROM "app"."autogen"."data.starts"
   GROUP BY time(1m), * fill(none)
   END;

3. take down host running influx for a period of time (say 15minutes) and restart

4. view graphs using the continuous query table and note 15minute gap of data

Expected behavior:
Describe what you expected to happen.
The continuous query should process the delayed batch data and fill in the hole created during the disconnected interval when the system is re-connected.

Actual behavior:
Describe What actually happened.
The continuous query data is left blank for the interval.

Environment info:

• System info: Run `` and copy the output here
  inux influxdb-5786ccb9f8-pjmqj 3.10.0-862.el7.x86_64 Queries should support an order clause and limit clause #1 SMP Fri Apr 20 16:44:24 UTC 2018 x86_64 Linux
• InfluxDB version: Run influxd version and copy the output here
  InfluxDB v1.7.8 (git: 1.7 ff383cd)
• Other relevant environment details: Container runtime, disk info, etc

Config:
Copy any non-default config values here or attach the full config as a gist or file.

Logs:
Include snippet of errors in log.

Performance:
Generate profiles with the following commands for bugs related to performance, locking, out of memory (OOM), etc.

# Commands should be run when the bug is actively happening.
# Note: This command will run for at least 30 seconds.
curl -o profiles.tar.gz "http://localhost:8086/debug/pprof/all?cpu=true"
curl -o vars.txt "http://localhost:8086/debug/vars"
iostat -xd 1 30 > iostat.txt
# Attach the `profiles.tar.gz`, `vars.txt`, and `iostat.txt` output files.