Document Loki onboarding for consumers
<!-- This template is for GitLab Team Members seeking support of SRE where there isn't an existing `request-*` template available. Please fill out the details below. --> With our Loki PoC well on the way, we'll need some documentation on how users can get up and running with it; It should include: - Easy to follow step by step guide - Example code - Helm Chart with example values - Dashboard links - Appropriate promtail links for advanced usage, with specific examples **Details** - Point of contact for this request: [+ @user +] - If a call is needed, what is the proposed date and time of the call: [+ Date and Time +] - Additional call details (format, type of call): [+ additional details +] **SRE Support Needed** [+ Support Request Details +] <!-- Please do not edit the below -->
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