Add support for YAML strategy

Introduces a new 'yaml' strategy using Ansible's `from_yaml` to read
target files. This allows users to group multiple targets with
distinct label sets (e.g., severity or job) within a single file,
optimizing Prometheus file-based service discovery.

- Refactored task structure into `strategy_*.yml` for consistency.
- Extracted shared exporter variable computation.
- Implemented label merging where exporter labels override defaults.
- Included support for groups and hosts without labels to prevent crashes.

PR: (#1) https://github.com/kliwniloc/ansible-role-prometheus-target/pull/1

1 files changed, 9 insertions, 0 deletions

diff --git a/defaults/main.yml b/defaults/main.yml
index 807f507..795e3cb 100644
--- a/defaults/main.yml
+++ b/defaults/main.yml
@@ -126,10 +126,15 @@ prometheus_target_exporter_defaults: {}
   # node_exporter:
   #   path: /opt/prometheus/targets.yml
   #   host: '{{ inventory_hostname }}:9100'
+  #   labels:  # Labels to match when using yaml strategy
+  #     severity: warning
+  #     job: external
   # blackbox_exporter:
   #   path: /opt/targets/blackbox.yml
   #   host: 'https://{{ hostvars[inventory_hostname].ansible_host }}'
   #   path_prefix: ''
+  #   labels:
+  #     severity: critical
 
 # This is where you specify the exporters that should be deployed to prometheus.
 # You should configure this on a per play basis. If you wish to configure
@@ -141,6 +146,10 @@ prometheus_target_exporter: []
   #   path: /path/to/targets/file/on/prometheus/host
   #   # overwrites: prometheus_target_exporter_defaults.node_exporter.host
   #   host: '{{ inventory_hostname }}:9100'
+  #   # labels to match the target group in the YAML file (yaml strategy only)
+  #   labels:
+  #     severity: warning
+  #     job: external
 
 # This is a list of exporters that will be appended to the
 # prometheus_target_exporter variable. duplicate exporters in