Ansible tasks to create and delete alertmanager silences

playbook.yml

# creates a silence in alertmanager that starts `now` and lasts for 10 minutes

- hosts: localhost
  gather_facts: yes
  tasks:
    - set_fact:
        start_datetime: "{{ ''| local_time_iso8601 }}"
        future_datetime: "{{ ''|local_time_iso8601 | add_time_iso8601(minutes=10)  }}"
    - debug:
        var: future_datetime
    - name: silence alertmanager for reboot
      uri:
        url: http://10.1.1.1:9093/api/v1/silences
        method: POST
        body_format: json
        body: >
          {
            "matchers": [
              {
                "name": "instance",
                "value": "{{ inventory_hostname }}",
                "isRegex": false
              }
            ],
            "startsAt": "{{ start_datetime }}",
            "endsAt": "{{ future_datetime }}",
            "createdBy": "ansible-system-update",
            "comment": "Silence for system-update reboot",
            "status": {
              "state": "active"
            }
          }
      register: silence_resp

    - debug:
        var: silence_resp

    - pause:

    - name: delete silence alertmanager for reboot
      uri:
        url: http://10.1.1.1:9093/api/v1/silence/{{ silence_resp.json.data.silenceId }}
        method: DELETE
      register: silence_resp_del

    - debug:
        var: silence_resp_del

time.py

# filters/time.py
# drop in your filters dir
import datetime
import dateutil.parser
import sys

if sys.version_info[0] < 3:
    raise Exception("Must be using Python 3")

fmt = "%Y-%m-%dT%H:%M:%S.%fZ"

def local_time_iso8601(string, **kwargs):
    return datetime.datetime.utcnow().replace(tzinfo=datetime.timezone.utc).isoformat()


def add_time_iso8601(string, **kwargs):
    dt = dateutil.parser.parse(string)
    return (dt + datetime.timedelta(**kwargs)).strftime(fmt)


class FilterModule(object):
    def filters(self):
        return {
            "local_time_iso8601": local_time_iso8601,
            "add_time_iso8601": add_time_iso8601,
        }