Influxdb alters check error

__Steps to reproduce:__
List the minimal actions needed to reproduce the behavior.

1. ...Use httpwebrequest from C# to write data to influxdb when an API function is executed(This means the data sending frequency is unexpected.)
2. ...Create Alert to check if a data point is below or above criteria.
3. ...Send alert to Slack if an alter detected

__Expected behavior:__
Should send alters to my slack workplace

__Actual behavior:__
It shows an error **[Last run status :complete(failed)]** when an alert should be triggered in the check section. So, there is no Check history, no Notification history recorded. Nothing sends to Slack either.
However, I have another check rule, which works fine. The only difference is that data is sent with a certain frequency.

__Environment info:__

* System info: Run `uname -srm` and copy the output here : NA
* InfluxDB version: Run `influxd version` and copy the output here : 2.0
* 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.

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

Start by reproducing the alert check after data is written through the C# HTTP client, then inspect the check execution and Slack notification behavior. The issue provides no logs or named files; done means the check completes successfully, history is recorded, and the alert reaches Slack.

Written by the indexing model from the issue text.