validate_external_observation

Validate a pending observation, promote to active, and publish the full aggregate priced protocol for ext_epi.

Handler narrative

Load the GLAM state or program account required by the instruction and verify the signer.
Verify that the integration is enabled on the vault and that the caller has the required delegate permission or owner authority.
Validate the instruction-specific policy, then invoke the external protocol with the vault authority where required.
Validate a pending observation, promote to active, and publish the full aggregate priced protocol for ext_epi. All position observations are stored in the single observation state PDA, so no remaining_accounts are needed.

The submitted accounts must match the declared account list, signer requirements, writable requirements, fixed program addresses, and account relationships shown below.
The GLAM state account is the source of truth for owner, enabled integrations, delegate permissions, policies, assets, borrowable assets, timelock settings, mint linkage, and pricing records.
The vault integration ACL must enable this integration before the instruction is accepted; that enablement is defined on the GLAM state account.
If the signer is not the owner, the delegate ACL on the GLAM state must contain the exact protocol permission required by this instruction; registering a delegate alone is insufficient.
Instruction-specific destination accounts must satisfy the external protocol's own account model; GLAM validates the accounts it needs for authorization and policy enforcement, then passes the remaining protocol accounts through CPI.

Uses the standard Big Seven account pattern, plus the instruction-specific accounts below.

Account	Role	Description
observation_state	writable	Program-derived account used by this instruction; clients should prefer SDK helpers when available.

Argument	Type	Notes
position_id	[u8; 32]	Thirty-two-byte external position identifier whose pending observation is being validated.
normalized_base_asset_amount	option<i128>	Optional signed amount in the vault base asset; use it when the validator supplies an already-normalized value.

Enable the External Position Interface integration before observations affect vault pricing.
Caller must be the owner or a delegate with the explicit protocol permission required by this instruction.

await glamClient.epi.validateExternalObservation(
  positionId,
  normalizedBaseAssetAmount,
);

The external position must be configured before observations are submitted; validation promotes a pending observation before refresh republishes aggregate pricing.