Add an optional delay in probes to allow for the changes to propagate in the instana system

When running instana experiments the api was returning an error status code due to a malformed url in an environment variable, an error should be logged to clearly identify the error status code has occurred

This probe would return a boolean to indicate if any critical events had been raised in the specified time window.

Parameters would be a window of time (start, end) and an optional delay parameter, defaulted to 5 seconds, as Instana's model can be up to 5 seconds behind the feeds from the target system.

Move over current code to use the Instana Python API:

https://docs.instana.io/quick_start/api/#python-rest-api-client
https://github.com/instana/python-sensor/blob/master/instana/api.py

Mostly for use inside an experiment's method to enrich the resulting journal.

API call would take the approximate form of:

curl --request GET \
  --url '.../api/events/<eventID>' \
  --header 'authorization: apiToken ********'

This is the page to be updated: https://chaostoolkit.org/extensions

Including:

• Doing the coverage testing
• Tag-style building of new versions to release to PyPy

This probe would return a boolean to indicate if any warning _or_critical events had been raised in the specified time window.

Parameters would be a window of time (start, end) and an optional delay parameter, defaulted to 5 seconds, as Instana's model can be up to 5 seconds behind the feeds from the target system.

The probe's signature will likely look like:

getAllEvents: string

And simply return the full json in a string to be used to enrich an experiment's journal. This probe is unlikely to be useful to steady-state hypothesis work.

The underlying API call will implement:

> curl --request GET \
  --url '.../api/events?from=1554143400000&to=1554237055206' \
  --header 'authorization: apiToken ********' 

This probe would return a boolean to indicate if any critical events had been raised in the specified time window.

Parameters would be a window of time (start, end) and an optional delay parameter as Instana's model can be up to 5 seconds behind the feeds from the target system.

"against a Instana" should be "against an Instana instance"

To incorporate items such as:

• Current processor load
• Current memory load

etc.